57+ free online tools that run in your browser

A complete toolbox that runs entirely in your browser: PDF and image editing, developer utilities, calculators, generators, timers and cognitive tests. Free, private, no upload, no account.

PDF — 11 tools

Merge, split, compress, convert and organise PDFs without uploading a thing.

• Merge PDF — Combine multiple PDFs into one
• Split PDF — Pull out pages or split into files
• Organize PDF Pages — Reorder & delete pages visually
• Rotate PDF — Fix the orientation of pages
• JPG to PDF — Turn images into a PDF
• PDF to JPG — Export pages as images
• Watermark PDF — Stamp text over your pages
• Add Page Numbers to PDF — Number every page
• PDF to Text — Extract selectable text
• Edit PDF Metadata — View & edit document info
• Compress PDF — Shrink image-heavy PDFs

Developer — 11 tools

Formatters, encoders, hashers and inspectors — the daily-driver dev bench.

• JSON Formatter — Beautify, validate & minify JSON
• Base64 Encoder & Decoder — Text and files to Base64, both ways
• URL Encoder & Decoder — Percent-encode and inspect URLs
• JWT Decoder — Decode and verify JSON Web Tokens
• Hash Generator — MD5, SHA, CRC32 & HMAC checksums
• Regex Tester — Test regular expressions live
• Diff Checker — Compare two texts line by line
• Unix Timestamp Converter — Unix epoch to date, and back
• Color Converter — HEX, RGB, HSL, HSV, CMYK & OKLCH
• Cron Expression Parser — Explain cron and preview next runs
• UDID Checker — Get your iPhone or iPad UDID, safely

Text & Writing — 6 tools

Count, clean, convert and compose text with instant, precise feedback.

• Word Counter — Words, characters, readability & keywords
• Case Converter — Change text case 15 ways instantly
• Text Cleaner — Trim, dedupe, sort & tidy any text
• Lorem Ipsum Generator — Classic filler text, exactly as needed
• Markdown Editor — Write Markdown with live preview
• Text to Speech — Read any text aloud in your browser

Calculators — 8 tools

Money, dates, units and health — answers with the working shown.

• Percentage Calculator — Every percentage question, worked out
• Unit Converter — One value, every unit, all at once
• Loan Calculator — Payment, interest & full amortisation
• Compound Interest Calculator — Growth, contributions & real returns
• Age Calculator — Exact age, to the day and minute
• Date Calculator — Days between dates & business days
• BMI Calculator — BMI, BMR, TDEE & calorie targets
• Number Base Converter — Binary, hex, octal, decimal & any base

Generators — 5 tools

Passwords, QR codes, IDs and palettes — generated locally, never logged.

• Password Generator — Strong passwords & passphrases
• QR Code Generator — Free QR codes as PNG or SVG
• UUID Generator — UUID v4 & v7, ULID and NanoID
• Random Number Generator — Numbers, dice, coins, lists & teams
• Color Palette Generator — Harmonies with WCAG contrast checks

Brain & Cognition — 10 tools

Measure reaction time, memory, attention and reasoning against real norms.

• IQ Test — Adaptive, IRT-scored full-scale IQ battery
• Brain Fog Test — Objective Brain Fog Index from 10 timed tasks
• Reaction Time Test — Measure your visual reaction speed
• Typing Speed Test — WPM, accuracy and consistency
• Number Memory Test — How many digits can you hold?
• Sequence Memory Test — Repeat the growing pattern
• Visual Memory Test — Remember the lit squares
• Verbal Memory Test — Seen it before, or is it new?
• Chimp Test — Beat the chimpanzee benchmark
• Aim Trainer — Hit 30 targets, timed to the ms

Time & Focus — 4 tools

Pomodoro, stopwatch, countdowns and time zones — accurate to the millisecond.

• Pomodoro Timer — Focus sprints, breaks and streaks
• Online Stopwatch — Millisecond timing with laps
• Countdown Timer — Any duration, with an alarm
• Time Zone Converter — Compare zones and plan meetings

Image & audio studios

• Image Resizer & Converter — Resize, convert & compress images in batches
• Audio Trimmer & MP3 Converter — Trim, convert & master audio in your browser