Free online tools

0-9

• 12/24 Time Format Converter (AM/PM ↔ 24h) | CalcBE
  Convert 12-hour AM/PM and 24-hour time formats instantly with copy buttons, shareable URLs, and batch conversion.
• 2-column / 3-column notes (T-chart) PDF generator | CalcBE
  Create 2- or 3-column note paper (T-chart) in millimeters. Adjust column ratios, headers, and ruled/dot guides, then print or save as PDF. Supports SVG, CSV, and shareable URLs.

A

• Annotation paper PDF generator (comment margin) | CalcBE
  Generate annotation paper with a wide comment margin in millimeters. Choose left/right/both comment columns, switch between ruled/dot/blank guides, and print or save to PDF. Export settings to CSV and share a URL to r…

B

• Beta Distribution Generator & Visualizer | CalcBE
  Generate random samples from a Beta distribution and visualize the PDF and histogram. Runs locally — no uploads; share settings-only URLs.
• Bingo card generator (printable) – 75/90 & custom | CalcBE
  No install, free. Generate printable bingo cards in your browser (75/90 ball, range, or custom word bingo), shuffle a call list, then print or download.

C

• Calligraphy guide sheet PDF generator | CalcBE
  Adjust x-height/ascender/descender ratios, slant angle (52–55°), unit lines, vertical guides, and left margin lines for calligraphy practice. Presets for Copperplate/Spencerian/Italic, A4/B5/Letter/A3, SVG output, pri…
• Card deck shuffler – shuffle & draw cards | CalcBE
  Shuffle a deck of playing cards and draw or deal cards in your browser. Choose decks and jokers, then copy or download results. Share settings only (no history in URLs by default).
• Chinese character grid (Tianzige / Mizhige) PDF generator | CalcBE
  Generate Tianzige/Mizhige practice grids in millimeters. Adjust rows, columns, cell size, bold lines every 5 cells, line colors, and header/footer for A4/B5/Letter. Includes no-guide and scan-friendly presets. Print a…
• Clock tools – timer, pomodoro, stopwatch | CalcBE
  Browse clock tools like the online timer, pomodoro, and stopwatch. Analog + digital displays, fullscreen mode, and keyboard shortcuts included.
• Compare PDFs by text – browser-only diff tool for document revisions | CalcBE
  Upload two PDFs, extract their text locally, and highlight differences by line or paragraph. No uploads—diff stays in your browser.
• Cornell notes PDF generator – cue/notes/summary layout | CalcBE
  Generate Cornell notes paper as SVG in millimeters. Adjust cue/notes/summary/header sizes, choose ruled/dot/blank guides, then print or save to PDF. Export settings to CSV and share a URL to reproduce the layout.
• Crop & resize PDF pages – adjust size, margins and orientation in your browser | CalcBE
  Crop and resize PDF pages in your browser. Draw a crop area, pick a target size (A4, Letter, or custom), add margins, and export—no uploads.

D

• Dice roller (d4–d100) with PNG sharing | CalcBE
  Roll d4–d100 with quick buttons or 2d6+3 notation. Totals, breakdowns, local history, and share as text or PNG — no sign-in.
• Dice stats (odds & distribution) + PNG sharing | CalcBE
  Compute odds and distributions for NdS +/- K. Auto switches Exact/Sim, shows a histogram, and lets you share as text, PNG, or URL — in your browser.
• Dice tools – roller, TRPG checks, dice stats | CalcBE
  Browser-only dice tools: dice roller, TRPG checks, and dice stats for odds and distributions.
• Dirichlet Distribution Generator & Visualizer (probability vectors) | CalcBE
  Generate probability vectors from a Dirichlet distribution and visualize marginals and simplex plots. Runs locally — no uploads; share settings-only URLs.
• Distribution sampler – random samples & histograms (normal, Poisson) | CalcBE
  Generate random samples from common distributions (normal, log-normal, gamma, poisson, and more). Visualize histograms, check summary stats, and download CSV/JSON — runs locally in your browser.
• Dot grid paper PDF generator – printable SVG in mm | CalcBE
  Generate dot grid paper as an SVG in millimeters. Adjust dot spacing, dot size, opacity, margins, calibration box, and guide markers. Print or save to PDF, export settings to CSV, and share a URL to reproduce the layout.

E

• Embed Builder — share links & iframe code | CalcBE
  Create CalcBE share links and responsive iframe embeds. Supports presets, UTM tags, base64url cfg, optional hash mode, and an auto-height snippet.
• Engineering paper PDF generator | CalcBE
  Generate engineering paper with 4/5/10 squares per inch converted to millimeters. Supports A4/Letter, 1-inch bold lines, frame lines, left band, and header boxes. Print or save to PDF, verify scale with the 50 mm cali…
• Event Countdown (Time Remaining) | CalcBE
  Show time remaining until a target date/time with an analog + digital display. Share settings by URL, embed via iframe, and switch local/UTC interpretation.

F

• Flashcard / index card PDF generator (cut guides) | CalcBE
  Auto-arrange 3×5, 4×6, A7 and more flashcards on a page with cut lines or crop marks. Supports duplex templates, back-side transforms, ruled/dot/Q&A layouts, gutter adjustments, SVG/CSV export, and shareable URLs.
• Free online tools – PDF, image, text, random | CalcBE
  Browser-only tools for PDF tasks, images, text formatting, worksheets, and random generators. No sign-in; files stay local.
• Free QR code generator & scanner – create, verify, download | CalcBE
  Generate QR codes for URLs, text, Wi-Fi, contacts, phone, email, and SMS. Preview and validate instantly, then download PNG/SVG/PDF or share a settings link — all in your browser.
• Full Screen Clock Online – Analog & Digital with Seconds | CalcBE
  Free fullscreen clock for your browser. Shows analog & digital time with seconds. Great for study, meetings, and presentations. 12/24-hour, UTC/local, dark mode.

G

• Genko yoshi manuscript paper PDF generator | CalcBE
  Generate genko yoshi manuscript paper in millimeters. Support vertical/horizontal layouts, 400/200 characters, cell sizing, split binding, fold marks, bold lines every 5 cells, and A4/B5/B4/Letter. Export SVG/CSV/shar…
• Graph paper PDF generator | Cartesian, polar, log-log | CalcBE
  Generate print-ready SVG graph paper in millimeters: Cartesian, polar, log-log, semilog, and isometric grids with How it's generated steps and CSV export.

H

• Habit Tracker Paper (Printable PDF)｜CalcBE
  Generate printable habit tracker paper as precise mm-based SVG. Switch between monthly (multiple habits × days) and yearly (12×31 for one habit), add weekdays/weekly separators/goals/notes, and export as print/PDF, SV…
• Hex grid paper PDF generator (chemistry, crystals, maps) | CalcBE
  Generate hex grid paper in millimeters with flat-top or pointy-top hexes. Adjust hex size, line width, opacity, major grid intervals, margins, background color, and alignment. Export SVG, CSV, share URLs, and verify s…

I

• Image Resizer & Format Converter | PNG, JPEG, WEBP | CalcBE
  Resize and convert images in your browser. Set width, height, format, and quality, then download—no uploads.
• Images to PDF – combine photos in browser | CalcBE
  Convert multiple images to a single PDF with page size, orientation, margins, and fit options. Runs fully in your browser with no uploads.
• Interval Timer (HIIT & Tabata) | CalcBE
  Analog + digital interval timer for HIIT/Tabata. Work/rest, rounds/sets, warm-up/cooldown, count-in, sound, and notifications supported.
• IPv4 subnet & CIDR calculator – network address, host range and usable IPs | CalcBE
  Convert any IPv4 address and prefix length into its network address, broadcast address, usable host range, and total capacity.

J

• JSON Formatter & Validator | Pretty-print and check errors | CalcBE
  Pretty-print, minify, and validate JSON in your browser. Highlight errors and copy formatted results without sending data to a server.

L

• Lined paper PDF generator – ruled paper in mm | CalcBE
  Generate lined (ruled) paper as an SVG in millimeters. Adjust line spacing, margins, margin lines, bold lines, calibration box, and hole-punch guide. Print or save to PDF, export settings to CSV, and share a URL to re…
• List Shuffler (Random Order Generator) – fair shuffle | CalcBE
  Shuffle a list fairly with Fisher–Yates. Copy results, share a URL, and optionally reproduce the same order with a seed—runs locally in your browser.

M

• Merge PDFs – reorder and combine multiple files locally in your browser | CalcBE
  Merge multiple PDFs in your browser. Reorder files, choose page ranges if needed, and download instantly with no uploads.
• Multi Timer | CalcBE
  Manage multiple countdown timers at once with analog + digital views, fullscreen focus, sound/notifications, presets, saving, and sharing.

N

• Number line & interval visualizer (inequality shading)
  Shade inequalities and interval unions on an interactive SVG number line. Visualize algebra steps, export SVG/PNG, and copy share-ready URLs for lessons.

O

• Online Alarm (Browser Alarm Clock) | CalcBE
  Analog + digital clock display with multiple alarms, snooze, notifications, and fullscreen support in your browser.
• Online Stopwatch with Analog + Digital Display | CalcBE
  Run a high-precision stopwatch with analog and digital displays, lap tracking, fullscreen, keyboard shortcuts, and a shareable settings URL. Works entirely in the browser.
• Online Timer (Countdown) | Analog & Digital | CalcBE
  Set an online countdown timer with analog and digital displays, presets, quick adjustments, fullscreen, keyboard shortcuts, and a shareable settings URL.

P

• Page numbers & watermarks – stamp PDFs in browser | CalcBE
  Add page numbers or text watermarks to a PDF entirely in your browser. Choose positions, formats, ranges, and opacity—no uploads.
• Paper templates hub (lined, grid, Cornell, to-do) | CalcBE
  Find lined paper, dot grid, Cornell notes, to-do sheets, habit trackers, graph paper, and more. Adjust in millimeters, print to PDF, export SVG, and share URLs to reuse the same layout.
• Passphrase generator (Diceware-style) – random words | CalcBE
  Generate a strong passphrase from random words (Diceware-style) locally in your browser. Choose word count, separators, and case, then copy or download. Share settings-only URLs (no passphrases).
• Password generator – strong secure random passwords | CalcBE
  Generate strong random passwords in your browser with crypto.getRandomValues. Exclude ambiguous characters, meet rules, copy or download. Share settings only (no passwords in URLs).
• Pattern String Generator — business IDs & sequences | CalcBE
  Generate business-style IDs from a pattern (date, sequence, random). Runs locally in your browser — no uploads; share settings-only URLs.
• PDF compressor – shrink large PDF files in your browser without uploads | CalcBE
  Reduce PDF size entirely in your browser. Choose quality presets or custom DPI/quality, convert to grayscale, and download instantly without uploading files.
• PDF form filler & flattener – complete forms and lock in answers in your browser | CalcBE
  Fill PDF form fields, preview highlights, keep fields editable or flatten them, and download instantly. All changes stay in your browser.
• PDF highlighter & annotator – markup in browser | CalcBE
  Highlight, draw, and place text notes on PDFs in your browser. Navigate pages, undo steps, and export a flattened annotated PDF—no uploads.
• PDF metadata editor – edit title, author & keywords | CalcBE
  Read and update PDF metadata such as title, author, subject, keywords, and dates entirely in your browser. No uploads required.
• PDF page organizer – reorder, rotate & delete pages | CalcBE
  Reorder, rotate, duplicate, or delete PDF pages in your browser. Drag thumbnails, then export a new PDF without uploading files.
• PDF sign & stamp tool – add signatures and approval stamps in your browser | CalcBE
  Create a signature, place it on pages, add dates or approval stamps, and export a signed PDF. All processing stays in your browser.
• PDF to EMF converter – preserve vectors & text positions | CalcBE
  Convert PDF to EMF in your browser while preserving vectors and text positions. Download page-by-page EMF files or a ZIP. Files never leave your device.
• PDF to images converter – export PDF pages as PNG or JPEG files in your browser | CalcBE
  Convert PDF pages to PNG or JPEG entirely in your browser. Choose resolution, format, and page ranges, then download each page or a ZIP—no uploads required.
• PDF to SVG converter – preserve vectors & text positions | CalcBE
  Convert PDF pages to SVG in your browser while preserving vectors and text positions. Choose page ranges, download single SVGs or a ZIP, and keep files local.
• PDF to text converter – extract text in browser | CalcBE
  Extract text from PDFs entirely in your browser. Combine pages or keep per-page output, choose layout or paragraph mode, and download as TXT with no uploads.
• PDF Tools (browser-only) | Compress, merge, convert, annotate | CalcBE
  A fast, private PDF toolkit that runs entirely in your browser: compress, merge, split, convert images, extract text, add watermarks, and more without uploading files.
• Permutation test – exact p-value for A/B and paired | CalcBE
  Run a permutation (randomization) test for two independent groups or paired samples. Visualize the null distribution and download a JSON/CSV report — all in your browser.
• Pomodoro Timer with Analog & Digital Display | CalcBE
  Run a pomodoro timer with analog and digital displays, automatic phase transitions, local stats, fullscreen, keyboard shortcuts, and a shareable settings URL.
• Primary handwriting paper PDF generator (3-line) | CalcBE
  Generate primary handwriting paper with headline + dashed midline + baseline. Adjust ruling height, midline position, margins, colors, and number of pages, then download a print-ready PDF.

Q

• Quick charts from pasted data — scatter / box plot + regression (with steps, PNG/PDF)
  Paste spreadsheet data to generate scatter and box plots instantly. Includes OLS, Theil–Sen, and polynomial regression with step-by-step math plus PNG/PDF export.

R

• Random CSV generator – test data & schema JSON | CalcBE
  Generate random CSV test data in your browser. Define columns, preview rows, then download CSV and schema JSON — no uploads and share settings-only URLs.
• Random Date & Time Generator – random datetime/timestamp | CalcBE
  Generate random dates, times, and datetimes in your browser. Choose a range, weekdays, exclusions, time windows, and steps. Copy/download results and share settings-only URLs.
• Random distributions: samplers, tests & visualizers | CalcBE
  Generate random samples from distributions, visualize histograms, and sanity-check randomness in your browser. No uploads; share settings-only URLs.
• Random JSON Generator (Test Data) — array & NDJSON | CalcBE
  Generate JSON test data from a schema. Export as JSON array or NDJSON. Runs locally in your browser — no uploads; share settings-only URLs.
• Random Log Generator — Nginx, Apache & JSON logs | CalcBE
  Generate fake access logs (Nginx/Apache) or JSONL logs with controllable distributions. Runs locally — no uploads; share settings-only URLs.
• Random number generator – integers, decimals, seeds | CalcBE
  Generate random integers or decimals in your browser with optional seeds, unique values, and copyable results. Runs locally — no sign-in, no uploads.
• Random Picker | Draw winners without repeats
  Pick one or more random items from a list in your browser. Great for lotteries, giveaways, and classroom activities. Everything runs locally without sending data to the server.
• Random SQL INSERT Generator — Postgres, MySQL, SQLite | CalcBE
  Generate SQL INSERT statements from a schema for Postgres, MySQL, or SQLite. Runs locally in your browser — no uploads; share settings-only URLs.
• Random test data generators (CSV, IDs, time) | CalcBE
  Create CSV test data, random IDs, and timestamps locally in your browser. No uploads; share settings-only URLs.
• Random tools – generators, pickers, shuffles | CalcBE
  Random generators and pickers that run entirely in your browser: numbers, dates, CSV test data, tokens, UUIDs, shuffles, and verifiable draws.
• Randomness beacon verifier – paste a beacon to verify draws | CalcBE
  Paste a public beacon value to verify a deterministic draw or shuffle. Create a commit hash, reproduce results, and download JSON/CSV/PNG — runs locally.
• Randomness tests – chi-square, runs, ACF, JB | CalcBE
  Run chi-square, runs, autocorrelation, and Jarque–Bera on bit or number sequences. Visualize results and download a report—runs locally in your browser.

S

• Seating Chart Generator (Random) — Classroom & Tables | CalcBE
  Free online seating chart generator for classrooms and events. Create random layouts with fixed seats and avoid-adjacency pairs. No sign-up. Print or export CSV/JSON/HTML.
• Secret Santa generator (exclusions) – draw names fairly | CalcBE
  Generate Secret Santa assignments in your browser. Add exclusions (NG pairs) and groups, then reveal recipients one by one to reduce accidental leaks. Copy, download, and share settings-only URLs.
• Seyes (French ruled) paper PDF generator | CalcBE
  Generate Seyes/French ruled paper in millimeters. Standard 2 mm minors + 8 mm majors, 8 mm verticals, red margin line, enlarged 3 mm/12 mm, A4/B5/Letter. Print at 100%, export SVG/CSV, and share URLs.
• Shuffle bias comparison – naive vs Fisher–Yates | CalcBE
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• Split PDF files – extract page ranges or every N pages locally in your browser | CalcBE
  Split a PDF into multiple files directly in your browser. Use page ranges, one-per-page, or every N pages—download results as a ZIP with no uploads.
• Staff paper PDF generator | CalcBE
  Generate staff paper in millimeters. Adjust staff spacing, system count (auto/manual), bar guides, lyric lines, and title fields. Supports A4/B5/Letter, SVG/CSV/share URLs, and print at 100% with the 50 mm calibration…
• Step-by-step solution PDF exporter — multi-language, A4/Letter, shareable JSON
  Build printable How it's calculated guides with numbering styles, attachments, and A4/Letter layouts. Export JSON, copy doc= base64url links, and print classroom-ready PDFs.
• Stochastic process visualizer – random walk & Markov chain | CalcBE
  Visualize random walks (1D/2D) and Markov chains from a transition matrix. See trajectories, MSD, and stationary distribution, then download results.
• Study timetable (time blocking) PDF generator | CalcBE
  Create weekly or daily time-blocking timetables in millimeters. Adjust start/end times, 15/30/60-minute slots, day count, break highlights, memo/to-do areas, bold line intervals, calibration box, and shareable URLs. P…
• Synthetic Time Series Generator — trend, seasonality & noise | CalcBE
  Generate synthetic time series data with trend, seasonality, noise, missing values, and outliers. Runs locally — no uploads; share settings-only URLs.

T

• TAB sheet PDF generator | CalcBE
  Generate guitar/bass TAB sheets in millimeters. Set string count, spacing, auto/manual systems, bar/beat guides, tuning boxes, and A4/B5/Letter paper. Export SVG/CSV, share URLs, and verify scale with the 50 mm calibr…
• Team generator – random teams & groups | CalcBE
  Split a list of names into random teams or groups in your browser. Choose number of teams or team size, add simple constraints, then copy or download results. Share settings only (no names in URLs by default).
• Text Case Converter — upper/lower/title, snake/camel/kebab | CalcBE
  Convert text between upper, lower, title, sentence, snake_case, camelCase, and kebab-case instantly in your browser.
• Time Zone Meeting Planner (Best Meeting Times) | CalcBE
  Plan meeting times from participants' time zones and working hours with analog + digital clocks, top suggestions, and an availability matrix.
• Todo checklist paper PDF generator (printable) | CalcBE
  Generate printable todo/checklist paper with checkboxes. Adjust columns, row height, due/priority/notes fields, and a 50 mm calibration square in millimeters. Print to PDF, export settings to CSV, and share a URL to r…
• Token generator – secure random strings (base64url, hex) | CalcBE
  Generate secure random tokens and random strings locally in your browser. Choose base64url, hex, or a custom charset. Copy, download, and share settings (no tokens in URLs).
• Triangular Distribution Generator (min/mode/max) | CalcBE
  Generate samples from a triangular distribution using min/mode/max and visualize the PDF and histogram. Runs locally — no uploads; share settings-only URLs.
• TRPG dice check (d20/d100, pools) with PNG sharing | CalcBE
  Run d20/d100 checks with advantage/disadvantage, compare vs DC, and roll dice pools to count successes. Share as text, PNG, or URL — all in your browser.
• Truncated Normal Generator & Visualizer (bounded normal) | CalcBE
  Generate samples from a truncated normal distribution with lower/upper bounds and visualize the PDF/CDF and histogram. Runs locally — no uploads; share settings-only URLs.

U

• UNIX Timestamp Converter (Seconds/Millis to Date) | CalcBE
  Convert Unix seconds/millis and date/time across Local, UTC, and IANA time zones with copy buttons and shareable URLs.
• UUID Generator (v4/v7) – bulk, format, validate, and parse | CalcBE
  Generate UUID v4 or UUID v7 in bulk, format them (canonical/URN/braces), copy or download, and validate UUIDs with v7 timestamp decoding—runs locally in your browser.

V

• Verifiable random draw (commit-reveal) – auditable picker | CalcBE
  Run a verifiable random draw using a commit-reveal scheme. Publish a commitment hash first, reveal the seed later, and let anyone reproduce and verify the results—runs locally in your browser.

W

• Weibull Distribution Generator & Visualizer | CalcBE
  Generate random samples from a Weibull distribution and visualize the PDF and histogram. Runs locally — no uploads; share settings-only URLs.
• Weighted Random Picker – random choice with weights | CalcBE
  Pick random items with weights (probability ratios). Use an optional seed for reproducible draws and share your setup via URL—runs locally in your browser.
• Worksheet & Quiz Auto-Generator (steps & PDF)
  Worksheet & quiz auto-generator with steps (PDF) - linear, quadratic, factoring, fractions, ratios. Deterministic seed for reproducible class handouts.
• World Clock Board (Multiple Time Zones) | CalcBE
  Compare multiple city times with analog + digital clocks, work-hour highlights, shareable URLs, and JSON export/import.

Z

• Zenkaku/Hankaku Converter – kana, fullwidth/halfwidth | CalcBE
  Convert Japanese text between fullwidth/halfwidth and Hiragana/Katakana in your browser. Your text never leaves your device.