ToolStack — Free Online Tools

Parse, validate, format, and minify JSON

UTF-8-safe Base64 encoder and decoder

Percent-encode and decode URI components

Test regular expressions with live match highlighting

Crypto-secure random passwords

Decode JSON Web Token header and payload

Generate QR codes for any URL or text

Pick colors and convert across HEX, RGB, HSL, OKLCH

Re-encode images at lower quality and dimensions

Combine multiple PDFs into a single document

Write Markdown with a live, sanitized HTML preview

Convert between Unix epoch and ISO/local datetime

Count words, characters, sentences, reading time

Convert text between 11 case formats

Generate placeholder text in any format

Compare two texts side-by-side

Encode and decode HTML entities

Escape and unescape \uXXXX sequences

Translate text to and from International Morse code

Convert numbers across bases 2 to 36

Convert IDN domains to and from punycode

MD5, SHA-1, SHA-256, SHA-512, and HMAC

Generate UUID v4, v7, and NIL identifiers

Score password strength and entropy

AES-GCM encrypt and decrypt with passphrase

Hash a file and verify against an expected digest

Generate mock JSON arrays from a schema

Convert between JSON and YAML in either direction

Convert between JSON and XML in either direction

Parse CSV to JSON and serialize JSON to CSV

Pretty-print and indent XML documents

Format SQL across multiple dialects

Pretty-print HTML markup

Parse and validate YAML, see line and column errors

Convert across length, weight, temp, and more

Convert datetimes between timezones

Compute the difference between two dates

Build and explain cron schedules in plain English

X% of Y, X is what % of Y, increase and decrease

Monthly payment, total interest, and amortization

Body Mass Index in metric or imperial units

Future value with regular contributions

Mean, median, mode, standard deviation and more

Convert Markdown to clean, sanitized HTML

Convert HTML markup back to Markdown

Sort lines alphabetically, naturally, by length, or shuffle

Remove duplicate lines, keep first or last, optionally sort

Literal or regex find-and-replace with whole-word + flags

Strip HTML to plain text and decode entities

Reverse text by characters, words, or lines (Unicode-safe)

Count word frequency with stopword and length filters

Read text aloud with the browser SpeechSynthesis API

Convert images between PNG, JPG, WebP, AVIF — all in your browser

Resize images by exact pixels or percentage

Visual crop with aspect-ratio presets and rule-of-thirds guides

Encode images to data-URLs and decode back to images

Strip whitespace, comments, and bloat from SVGs

Inspect EXIF, GPS, and TIFF tags in JPEG / HEIC files

Extract dominant color and palette from any image

Cut out the background using an in-browser ML model

Score contrast against WCAG AA and AAA standards

Build tonal, complementary, triadic, and tetradic palettes

Build linear and radial CSS gradients with live preview

Stack multiple shadow layers with X/Y/blur/spread

Draggable timing-function editor with animated preview

Draw polygon clip-paths and copy the CSS

Per-corner elliptical border-radius with live preview

Convert between px / rem / em / pt / % / vw / vh / ch

Generate favicons + PWA manifest in a downloadable zip

Scan QR codes from a camera or uploaded image

Generate Open Graph + Twitter + meta tag blocks

Convert text to URL slugs with transliteration

Preview how a URL renders on Facebook, Twitter, LinkedIn

Searchable reference of every HTTP response code

Searchable reference of common HTTP headers

Searchable reference of common MIME content types

Customizable focus timer with notifications

Add, complete, and filter tasks with auto-save

Multi-tab notepad with live word count and auto-save

Random number, coin flip, dice roll, and wheel of names

View PDFs in your browser, no upload required

Split a PDF by page ranges into separate files

Tag a PDF with restriction metadata (advisory only — not enforced encryption)

Remove owner-only restrictions from a PDF that opens without a password

Convert each PDF page to a JPEG image

Permanently black out PDF regions — redacted pages are flattened so the original text cannot be recovered

Edit CSV files in an inline table with row/column tools

Convert between CSV and XLSX, split multi-sheet workbooks

Trig, logs, powers, factorial, constants, memory, and history in DEG or RAD

Convert Unix file permissions between octal and symbolic notation

Calculate network, broadcast, host range, and netmask for any CIDR block

Calculate tip and total for any bill, split between any number of people

Calculate exact age in years, months, days plus total days, weeks, and hours

Equated Monthly Installment, total interest, and amortization schedule for any loan

Validate card numbers with the Luhn algorithm and detect Visa, Mastercard, Amex, and more

Searchable reference of all 256 ASCII / Latin-1 characters with dec, hex, oct, bin, HTML

Code point, UTF-8 / UTF-16 bytes, escapes, block, and category for any character

Browse and search hundreds of popular emojis by category, click to copy

Searchable reference for ISO 3166-1 countries, ISO 4217 currencies, and ISO 639-1 languages

Online stopwatch with start, pause, reset, and lap timing accurate to the centisecond

Countdown timer with quick presets, audio alert, and optional browser notification

Generate random first + last names for fictional characters and test data, filter by gender

Spin a weighted wheel to make any random choice — supports per-option weights

Day of week, ISO week number, day-of-year, and leap-year info for any date

Send HTTP requests to CORS-enabled APIs and inspect responses — runs in your browser

Encode and decode HTTP Basic Authentication headers from username and password

Sign JSON Web Tokens with HS256, HS384, or HS512 in your browser

Parse a user-agent string into browser, engine, OS, device, and CPU details

Convert cURL commands to JavaScript fetch, axios, Python requests, Node.js, or PowerShell

Compute HMAC-SHA-1, SHA-256, SHA-384, or SHA-512 with any secret

Generate and verify bcrypt password hashes with a tunable cost factor

Generate Time-based One-Time Passwords from a base32 secret — RFC 6238 compatible

Generate strong, memorable passphrases from the EFF Diceware wordlist (7,776 words)

Generate TypeScript interfaces or type aliases from any JSON sample

Generate Go structs with JSON tags from any JSON sample

Run JSONPath expressions against any JSON document and inspect the matched paths and values

Validate JSON documents against a JSON Schema (Draft 2020-12) and see precise errors

Minify JavaScript with Terser — mangle, compress, and strip whitespace

Minify CSS with clean-css — strip whitespace, merge rules, and shorten values

Minify HTML — collapse whitespace, remove comments, and shrink inline CSS and JS

Convert any color between HEX, RGB, HSL, HSV, CMYK, and OKLCH side-by-side

Generate frosted-glass CSS with live preview — backdrop-filter blur and rounded borders

Generate soft-UI box-shadow CSS for flat, concave, convex, or pressed shapes

Build CSS Grid layouts visually — adjust columns, rows, and gap with live preview

Experiment with flex-direction, justify-content, align-items, and wrap with a live preview

Convert text to bold, italic, script, monospace, and other real Unicode characters

Build markdown tables in a spreadsheet-like editor with per-column alignment and live preview

Write and preview Mermaid diagrams — flowcharts, sequence, class, state, and ER diagrams

Live HTML, CSS, and JavaScript playground in a sandboxed iframe

Roll virtual dice with 4–100 sides for tabletop games and decisions

Flip a virtual coin once or many times to settle decisions or generate random bits

Encode or decode ROT13 ciphered text — letters shift 13 places, non-letters pass through

Format minified or ugly JavaScript with adjustable indent and brace style

Format minified or compressed CSS with adjustable indent

Create a scannable Wi-Fi QR code so guests can join your network without typing the password

Create a contact card QR code so people can save your info to their phone with one scan

Generate Schema.org JSON-LD for Articles, Products, Events, FAQs, Organizations and more — improve rich-result eligibility

Combine JPG or PNG images into a single PDF with custom page size, orientation and margins

Rotate one page or every page of a PDF by 90, 180 or 270 degrees

Encrypt a PDF with a password using AES-128 — opens in Adobe Acrobat, Apple Preview, and Foxit.

Extract all text from a PDF and copy or download as plain text

Flip an image horizontally or vertically, or rotate it by 90/180/270 degrees

Apply grayscale, sepia, blur, contrast, brightness, saturation, hue rotation and invert filters to any image

Add a text or image watermark to any photo with full control over position, opacity and rotation

Mark a watermark, then remove it with an in-browser AI inpainting model — original pixels outside the mask are preserved exactly

Generate classic top-and-bottom Impact text meme images from any photo

Deep-compare two JSON documents and see added, removed, and changed keys

Generate Subresource Integrity hashes (sha256 / sha384 / sha512) for any URL or content

Build .env templates for Next.js, Express, Django, Laravel, Prisma, or custom stacks

Analyze 1, 2, and 3-word phrase frequency and density for any block of text

Convert between Arabic and Roman numerals from 1 up to 3,999,999

OpenPGP-compatible encrypt, decrypt, and key generation in your browser

Track daily habits with streak counts and a GitHub-style heatmap

Split an image into a grid of tiles and download each tile or as a ZIP

Convert any image to ASCII art with adjustable width and character sets

Convert audio between MP3, WAV, OGG, AAC, and FLAC with bitrate and sample-rate control

Convert videos between MP4, WebM, MKV, MOV, and GIF — re-encode with H.264 or VP9, scale resolution, drop audio

Open and read .docx files in your browser with formatted text, lists, tables, and images

Open and read .pptx slide decks in your browser — slide-by-slide navigation, titles, bullet text, and embedded images

Open .xlsx, .xls, .ods, and .csv spreadsheets in your browser — multi-sheet tabs, column letters, and copy-friendly cells

Open .epub books in your browser with chapter navigation, embedded images, and clean reading typography

Decode and inspect X.509 certificates, CSRs, public keys, and private keys from PEM input

Decode Base64 SAML requests and responses, then inspect Issuer, NameID, attributes, and conditions

Generate a JSON Schema (draft-07 or 2020-12) from a JSON sample with inferred types, formats, and required keys

Convert any photo into a pencil-sketch line drawing using a Sobel edge filter

Parse SQL INSERT statements and export the rows as JSON or CSV

Compare two texts and see a percentage match plus highlighted overlapping phrases

Generate random nouns, verbs, adjectives, or any combination — with length and start-letter filters

Strip every emoji out of text and copy the cleaned result

Fetch a URL and extract its meta, Open Graph, and Twitter tags into a checked table

Fetch and parse a sitemap.xml, count URLs, and flag missing lastmod or oversize entries

Build a robots.txt file rule by rule, or paste one and test whether a URL is allowed

Look up a domain’s SSL certificate via Certificate Transparency and see expiry, issuer, and SANs

Build a clean PDF invoice with line items, tax, and totals — live preview, browser-only

Rename many files at once with prefix, counter, suffix, find-and-replace, and download as a ZIP

Remove specific PDF pages by checkbox or page-range expression

Inspect EXIF, GPS, and camera data in any image, then strip it all out before sharing

Expand many short URLs at once and see the final destination, redirect chain, and any errors

Pull every email address out of any text, deduplicate, and rank by domain

Format messy phone numbers into US, International, E.164, or national style with validation

Draw rectangles over faces or sensitive info and blur each region with adjustable intensity

Generate a printable monthly calendar with country holidays, custom events, and PDF or PNG export

Generate a realistic receipt with itemized lines, tax, and totals — download as image or PDF

Pick cities and see a 24-hour overlap timeline showing when everyone is awake and at work

See your exact age, days until your next birthday, zodiac signs, and famous people who share your date

UTF-8 Base64 encode and decode — standard or URL-safe, with optional MIME line wrapping

Convert HTML to JSX — rename class to className, inline styles to objects, self-close tags

Fetch a webpage and extract every CSS color used, ranked by frequency, exportable as CSS or Tailwind

Look up A, AAAA, CNAME, MX, TXT, NS, and SOA records for any domain via DNS-over-HTTPS

Recompress images inside a PDF at high, medium, or low quality and see the size savings

Validate huge JSON instantly with line and column errors and one-click fixes for common mistakes

Draw or type a signature, drag it onto any PDF page, and download the signed file

Record your screen, window, or tab with optional microphone audio and save as a WebM video

Build a .gitignore by combining 50+ stack templates — Node, Python, React, Rust, and more

Extract text from images and screenshots using browser-based OCR — your files never leave your browser.

Turn a scanned PDF into a searchable PDF — runs entirely in your browser, no upload.