UsefulTab
Quick tools for everyday tasks, right in your browser.
Free tools for images, PDFs, text, code, calculations, unit conversions and device tests — no signup, and your files are processed on your device.
Recently used
JSON Formatter
Format, minify, and validate JSON in your browser.
Merge to PDF
Combine PDFs and images (JPG, PNG, WebP) into a single PDF.
Word Counter
Live word, character, sentence, and reading-time counts for any text.
BMI Calculator
Calculate BMI from height and weight, with the World Health Organization category.
Password Generator
Generate cryptographically random passwords with your choice of length and character sets — uppercase, lowercase, numbers, and symbols.
QR Code Generator
Generate a QR code from text or a URL and download it as PNG or SVG.
Image Compressor
Compress JPG, PNG, and WebP images to a smaller file size, locally.
Loan EMI Calculator
Work out the monthly EMI, total repayment, and total interest for any fixed-rate loan.
Percentage Calculator
Calculate X% of Y, what percent one number is of another, and percent increase or decrease.
Base64 Encoder / Decoder
Encode text to Base64 or decode it back, UTF-8 safe.
Case Converter
Change text case: UPPERCASE, lowercase, Title, Sentence, camel, snake, kebab.
Color Converter
Convert a color between HEX, RGB, and HSL with a live swatch.
Browse by category
All tools →Why UsefulTab?
Privacy first
Your files and text are processed in your browser and are never uploaded to a server.
Instant results
No uploads, no waiting on a server. Results compute the moment you type or drop a file.
Free, no signup
Every tool is free to use with no account, no paywall, and no feature locked behind a login.
Works everywhere
Runs in any modern browser on desktop or mobile. A tool you have opened before reopens offline in the same browser.
ImageFit
Arrange and fit images onto print-ready pages.
HEIC to JPG
Turn iPhone HEIC photos into JPG, PNG, or WebP.
Image Compressor
Compress JPG, PNG, and WebP images to a smaller file size, locally.
Prepare Image for Upload
Choose a photo once: crop it, set exact pixels and a KB limit, and download a checked result.
Resize Image to KB
Shrink JPG, PNG, or WebP to at or below a KB limit — 20, 50, 100 KB — for forms and portals, locally.
Image Resizer
Resize JPG, PNG, and WebP images by width, height, or percent, locally.
Image Converter
Convert images between JPG, PNG, WebP, HEIC, AVIF — local, no upload.
WebP to PNG
Convert WebP images to lossless PNG — batch, local, no upload.
PNG to JPG
Convert PNG to JPG with a quality slider — batch, local, no upload.
Image Cropper
Drag a selection box over your image and export just that region — no upload.
Flip Image
Flip or mirror JPG, PNG, and WebP images horizontally or vertically, locally.
Rotate Image
Rotate JPG, PNG, and WebP images left, right, or upside down, locally.
Social & Shop Cropper
Crop or pad one image into exact Etsy, Instagram, YouTube, and OpenGraph sizes at once.
Seamless Pattern Tester
Drop a tile and see it repeat seamlessly — standard, half-drop, or brick — at any scale.
Batch Watermarker
Apply a logo PNG or tiled text watermark across a batch of photos — locally.
DPI & Print Size Calculator
Convert pixels to inches/cm at any DPI, and set the DPI metadata of JPG/PNG files without re-encoding.
Image to Base64
Turn any image into a Base64 data URI for CSS, HTML, or JSON — no upload.
Remove Image Metadata
Strip EXIF, GPS, and camera metadata from images — local, no upload.
EXIF Metadata Viewer
View EXIF, camera, date, and GPS metadata in a photo — local, no upload.
Image Color Picker
Click any pixel in an image to grab its HEX, RGB, and HSL color.
GIF Maker
Combine images into an animated GIF with adjustable speed and size.
Favicon Generator
Upload an image and generate favicon PNGs at 16, 32, 48, 180, 192, and 512 px, with the HTML to drop into your site — all locally.
PrintFit
Fit text onto the number of printable pages you choose.
Merge to PDF
Combine PDFs and images (JPG, PNG, WebP) into a single PDF.
Prepare a PDF
Add PDFs and photos once, then reorder, rotate and remove pages, compress if you need to, and download a checked PDF.
Word to PDF
Convert a Word .docx document to a PDF, locally — no signup, no upload.
Images to PDF
Combine JPG, PNG, and WebP images into a single PDF — local, no upload.
Split PDF
Pull out a page range, or split a PDF into one file per page — no upload.
Remove PDF Pages
Delete pages from a PDF by range — keeps the rest, local, no upload.
Compress PDF
Reduce PDF file size with an adjustable quality — great for scans, no upload.
Rotate PDF
Rotate a PDF 90°, 180°, or 270° — all pages or a chosen range.
Sign PDF
Stamp a typed or hand-drawn signature onto a PDF — local, no upload.
PDF to Images
Turn every page of a PDF into a PNG image — pick the resolution, no upload.
PDF to JPG
Turn PDF pages into compact JPG images — pick quality and scale.
Add Page Numbers to PDF
Add page numbers to a PDF with a chosen position, format, and range.
Watermark PDF
Add a diagonal text watermark to every page of a PDF, locally.
Crop PDF
Crop margins from PDF pages by percentage, with a live preview.
Extract Images from PDF
Extract the original embedded images from a PDF, one file each.
Invoice Generator
Fill in line items, tax, and your logo and download a clean PDF invoice — data stays local.
Word Counter
Live word, character, sentence, and reading-time counts for any text.
Case Converter
Change text case: UPPERCASE, lowercase, Title, Sentence, camel, snake, kebab.
Find & Replace
Search and replace across any text with case-insensitive, whole-word, and regex options.
Sort & Dedupe Lines
Sort text lines alphabetically, numerically, or reversed, and remove duplicate lines.
Reverse Text
Flip text backwards by characters, reverse word order, or reverse the order of lines.
NATO Phonetic Alphabet Converter
Convert any text into the NATO phonetic alphabet (A=Alpha … Z=Zulu), with digits spoken and punctuation named, then copy it or play it aloud.
ASCII Art Generator
Type a word and get big monospace ASCII banner art — pick a block or small font and copy it into a README or comment.
Text Diff Checker
Compare two blocks of text and highlight added and removed lines.
Remove Line Breaks
Remove or normalize line breaks — join lines, drop empty lines, and trim.
Slugify
Convert text into a lowercase, dash-separated URL slug with accents stripped.
Lorem Ipsum Generator
Create lorem ipsum placeholder text by paragraphs, sentences, or words.
Gradient Text Generator
Type text, pick two colors and a direction, and copy ready-to-use CSS for a gradient text effect.
Text to Speech
Turn text into speech with adjustable voice, rate, and pitch.
Character & Byte Counter
Live character, Unicode code point, line, and UTF-8 / UTF-16 byte counts for any text.
JSON Formatter
Format, minify, and validate JSON in your browser.
Base64 Encoder / Decoder
Encode text to Base64 or decode it back, UTF-8 safe.
URL Encoder / Decoder
Percent-encode or decode URI components with an encode/decode toggle.
HTML Entities Encoder / Decoder
Encode text to HTML entities or decode entities back to characters.
JWT Decoder
Base64url-decode a JWT to inspect its header and payload claims.
UUID Generator
Generate cryptographically random v4 UUIDs in bulk.
ULID Generator & Decoder
Generate 1–100 monotonic, lexicographically sortable ULIDs from secure randomness, and decode any ULID back to its millisecond timestamp and ISO date.
Color Palette & Gradient Generator
Pick a base color to generate harmonious palettes and a CSS linear gradient, with copyable hex codes and CSS — all locally.
QR Code Generator
Generate a QR code from text or a URL and download it as PNG or SVG.
Random Number Generator
Pick a min, max, and how many numbers to generate — with an option to disallow duplicates.
CSS / JS / HTML Minifier
Strip comments and whitespace from CSS, JS, or HTML and see how much you saved.
Side-by-Side Diff Viewer
See two versions of a text side by side, aligned line-by-line with changes highlighted.
Regex Tester
Write a regex, pick flags, and see every match highlighted with capture groups.
Markdown to HTML
Write Markdown and get clean HTML, with a live rendered preview — no upload.
Cron Expression Explainer
Turn a cron expression into plain English and preview when it runs next.
LLM Token Counter
Estimate token counts and context-window usage for GPT, Claude, and Gemini — all locally.
JSON to Types
Paste JSON and get TypeScript interfaces, Zod schemas, or Python Pydantic models.
cURL to Code
Paste a cURL command and convert it to JavaScript fetch, axios, or Python requests.
Chmod Calculator
Tick read/write/execute for owner, group, and public to get the octal and symbolic chmod.
SVG Blob & Wave Generator
Generate customizable SVG blobs and wave section dividers with copyable markup and CSS.
IPv4 Subnet Calculator
Enter an address and CIDR to get the network and broadcast addresses, subnet and wildcard masks, usable host range and count, IP class, and a binary view.
IPv4 Converter
Convert an IPv4 address live between dotted-decimal, dotted-binary, hex, 32-bit integer, and IPv6-mapped form — edit any field to update the rest.
MAC Address Tool
Generate random, valid, locally-administered MAC addresses with casing, separator, and prefix options, plus an honest vendor lookup over a small built-in OUI sample.
URL Parser & Query Editor
Split a URL into protocol, host, port, path, and hash, then add, edit, or remove query parameters in a table that rebuilds the URL instantly.
User-Agent Parser
Detect your own browser's User-Agent or paste any UA string to break out browser, engine, OS, CPU, and device type with a dependency-free parser.
Open Graph Generator
Fill in title, description, URL, and image to get copy-ready Open Graph and Twitter Card meta tags with a live preview of the share card.
QR Code Scanner
Decode QR codes from your camera or an uploaded image, locally.
Barcode Generator
Create barcodes (Code128, EAN, UPC, Code39) and download SVG or PNG.
SVG Viewer & Optimizer
Preview, clean up, and minify SVG markup right in your browser.
JSON to CSV
Convert a JSON array of objects into CSV — headers, quoting, no upload.
CSV to JSON
Convert CSV into a JSON array of objects — header-aware, no upload.
JSON ↔ YAML
Convert JSON to YAML and YAML to JSON — locally, no upload.
YAML Formatter
Validate, re-indent, and sort YAML keys — locally, no upload.
XML Formatter
Validate and indent XML with clear errors — locally, no upload.
XML ↔ JSON
Convert XML to JSON and JSON to XML — locally, no upload.
SQL Formatter
Format and indent SQL for many dialects — locally, no upload.
CSV Viewer
View CSV files as a sortable, searchable table entirely in your browser.
CSV to Excel
Turn CSV data into a downloadable Excel .xlsx file in your browser.
JSON Diff
Paste two JSON documents and see added, removed, and changed values by path — ignoring key order.
TOML Converter
Convert TOML to JSON, JSON to TOML, or TOML to YAML — locally, no upload.
List Converter
Paste a column of lines and join, quote, prefix, trim, dedupe, sort, or reverse — great for SQL IN() lists.
IBAN Validator
Validate an IBAN with the ISO 7064 MOD-97 checksum, identify the country, and see the check digits, BBAN, and a print-friendly grouping.
Phone Number Parser
Parse a phone number and a default country into E.164, international, national, and RFC 3966 forms — a pragmatic formatter for common countries.
Email List Normalizer
Paste a list of emails to lowercase, trim, drop invalid and duplicate addresses, and canonicalize Gmail dots and +tags — with a removed/duplicate count.
Percentage Calculator
Calculate X% of Y, what percent one number is of another, and percent increase or decrease.
Discount Calculator
Work out the final price and savings from a single discount or several stacked discounts.
Tip Calculator
Enter a bill, tip percentage, and number of people to see the tip, total, and per-person share.
Unit Price Calculator
Enter the price and quantity of two products to see which is cheaper per unit.
Loan EMI Calculator
Work out the monthly EMI, total repayment, and total interest for any fixed-rate loan.
Compound Interest Calculator
Project a final balance and total interest earned from a principal, rate, term, and compounding frequency.
Fuel Cost Calculator
Enter trip distance, your vehicle's fuel economy, and the fuel price to see the fuel needed and total cost of the journey.
BMI Calculator
Calculate BMI from height and weight, with the World Health Organization category.
Calorie Calculator
Enter your age, sex, height, weight, and activity level to estimate your BMR and daily calorie needs using the Mifflin-St Jeor equation.
Age Calculator
Calculate exact age and total days lived from a date of birth.
Date Difference Calculator
Pick a start and end date to see the gap in days, weeks, months, and years.
Aspect Ratio Calculator
Enter an original width and height plus one new dimension, and get the matching dimension that preserves the aspect ratio.
Download Time Calculator
Enter a file size and your connection speed to see the transfer time and the exact clock time it finishes.
Pace Calculator
Find running pace, finish time, or distance from the other two values.
Random Wheel Picker
Enter names or options and spin a wheel to pick one at random.
Pomodoro & Countdown Timer
Work in focus/break cycles or count down a custom time, with an end-of-timer beep and optional browser notification.
Stopwatch
Time anything with start, stop, and lap — accurate to the hundredth of a second and running entirely in your browser.
Time Calculator
Add and subtract times and durations, or measure the duration between two times.
Time Card Calculator
Add up work hours across days with breaks and overtime, and see pay.
Time Zone Converter
Convert a time from one zone to several others, with correct DST.
Calendar Event Generator
Fill in an event and download an .ics file or get Google/Outlook add-to-calendar links.
Meeting Overlap Planner
Compare 2–5 cities on one 24-hour bar and see the overlapping working hours at a glance.
Length Converter
Enter a length in any unit and see it in metres, kilometres, miles, yards, feet, inches and more — live.
Weight Converter
Enter a weight in any unit and see it in kilograms, grams, pounds, ounces, stone and tonnes — live.
Temperature Converter
Enter a temperature in one scale and see it in Celsius, Fahrenheit and Kelvin at the same time.
Volume Converter
Enter a volume in any unit and see it in litres, millilitres, cubic metres, US gallons, quarts, pints, cups and fluid ounces — live.
Area Converter
Enter an area in any unit and see it in square metres, square feet, acres, hectares and more — live.
Speed Converter
Enter a speed in any unit and see it in metres per second, km/h, mph, knots and ft/s — live.
Time Duration Converter
Enter a duration in any unit and see it in seconds, minutes, hours, days and weeks — live.
Data Storage Converter
Enter a size in any unit and see it in bits, bytes, kilobytes, megabytes, gigabytes and terabytes — live.
Number Base Converter
Convert whole numbers between binary, octal, decimal, hexadecimal, and any base from 2 to 36 — live and locally.
Unix Timestamp Converter
Convert between a Unix epoch timestamp and a human date live, with ISO, local, and relative views.
Roman Numeral Converter
Type an Arabic number or a Roman numeral and see the other update live, with a symbol-by-symbol breakdown.
Color Converter
Convert a color between HEX, RGB, and HSL with a live swatch.
Password Generator
Generate cryptographically random passwords with your choice of length and character sets — uppercase, lowercase, numbers, and symbols.
Hash Generator
Generate SHA-256 and other SHA hashes from text, entirely in your browser.
Password Strength Checker
Check password strength, entropy, and crack-time estimates locally.
TOTP / 2FA Code Generator
Paste a Base32 secret or otpauth:// URI and get the live TOTP 2FA code with a countdown.
Text Encrypt / Decrypt
Encrypt or decrypt text with a passphrase using AES-256-GCM and PBKDF2 — entirely in your browser.
RSA Key Generator
Generate a 2048 or 4096-bit RSA key pair in your browser and export public (SPKI) and private (PKCS#8) keys as PEM.
String Obfuscator
Mask the middle of secrets while keeping a few characters visible — set keep-first, keep-last, mask character, and preserve delimiters.
URL Cleaner
Paste a link to remove utm_* and click-ID tracking parameters and unwrap Outlook SafeLinks, with a list of exactly what was removed.
File Checksum Verifier
Drag in a multi-GB .iso or .dmg and compute its SHA-256/MD5 to verify integrity — locally.
PGP Encrypt & Keygen
Create a PGP keypair and encrypt or decrypt messages with a passphrase or key — in your browser.
Wi-Fi QR Card Generator
Turn your Wi-Fi name and password into a scannable QR code on a clean, printable guest card.
Keyboard Tester
Test every key on your keyboard — pressed keys light up on a live layout, with key names and codes.
Mouse Tester
Test your mouse: left, right, middle, and side buttons light up, movement is traced, and scroll direction is shown.
Double-click Tester
Test whether your mouse registers accidental double-clicks — see the gap between clicks in milliseconds.
Click Speed Test
Click as fast as you can for 1 to 60 seconds and see your clicks per second, click count and best run.
Spacebar Counter
Press Space as fast as you can for 5 to 60 seconds, or with no limit, and see your presses and presses per second.
Reaction Time Test
Wait for the pad to turn green, then click as fast as you can. Five rounds give your average, median and best reaction time.
Typing Speed Test
Type a run of common words for 15 seconds to 2 minutes and get your words per minute (WPM), raw WPM and accuracy.
Mouse Polling Rate
Move your mouse to measure its polling rate in Hz — how often it reports position (125, 500, 1000 Hz).
Gamepad Tester
Connect a controller and watch its sticks, triggers, and buttons react live — plus a rumble test.
Microphone Test
Test your microphone: see a live input-level meter and waveform, pick a device, and confirm it picks up sound.
Webcam Test
Test your webcam: see a live preview, pick a camera, and read its resolution and frame rate.
Speaker Test
Test your speakers: play a tone to the left channel, right channel, or both, and confirm each side works.
Headphone Left/Right Test
Test headphone channels: play left and right tones on demand or run an automatic left-right sequence.
Screen Test
Test your monitor with full-screen solid colors and patterns to spot dead pixels, backlight bleed, and uniformity issues.
Dead Pixel Test
Find dead and stuck pixels: cycle solid red, green, blue, white, and black full-screen and inspect for off or wrong-color dots.
Refresh Rate Test
Measure your monitor's refresh rate (60, 120, 144 Hz) by timing browser animation frames — with current, average, and peak.
Touchscreen Test
Test your touchscreen: draw with your finger, see each touch point tracked, and check multi-touch support.
Browser Permissions Test
Check browser permissions: see the granted, denied, or prompt state for camera, mic, location, notifications, and more.
Display Resolution
Show your display info: screen resolution, browser viewport size, device pixel ratio, color depth, and orientation.
Color Test
Test your screen's color: full-screen solid RGB and CMYK fills, smooth gradients, and grayscale ramps to check color accuracy and banding.
Audio Trimmer
Trim an MP3, WAV, or M4A to a start/end selection and download the clip as WAV — all in your browser.
Silence Remover
Automatically cut the silent gaps at the start and end of an audio clip and download a tighter WAV — locally.
Volume Changer
Boost or reduce the volume of an audio file, or normalize it to full level, and download a WAV — all locally.
Audio Speed Changer
Change how fast an audio file plays — speed it up or slow it down — and download a WAV, all in your browser.
Audio Converter
Convert MP3, M4A, OGG, and more to WAV — or to WebM/Opus where your browser supports it — all locally.
Extract Audio from Video
Extract the audio track from an MP4, WebM, or MOV video and download it as WAV — all in your browser.
Video Trimmer
Trim a video to a start/end selection and download the clip as WebM — captured entirely in your browser.
AI Model Explorer
Find open AI models by task, then compare setup, strengths, and license terms in plain English.
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The tools run in your browser — no signup, no uploads, no limits.