All-in-One Converter
Simple tools for everyday format conversion.
JustConvert is a free, browser-based suite of 94 converter tools for developers, writers, and everyday users. Convert JSON, Markdown, images, text, and more — instantly, without signup or file uploads.
Runs in your browser
No server uploads, no data leaving your device
No account required
Every tool works instantly, zero friction
94 tools available
Encoding, JSON, Text, Dev, and Image tools
What you can convert
Encoding
Base64, URL encode, HTML entities, ROT13, Morse code
JSON
Format, diff, validate, convert to YAML / CSV / TypeScript / HTML
Text
Case converter, diff, regex tester, word counter, Lorem Ipsum
Dev
JWT, hash generator, UUID, cron parser, color converter, QR code
Image
Resize, compress, crop, filter, flip/rotate, ASCII art, metadata
Available converters
94 tools
Markdown → HTML
Convert Markdown to clean HTML instantly. Supports GFM, tables, code blocks, and more.
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JSON → YAML
Convert JSON to YAML format instantly. Supports nested objects, arrays, and complex structures.
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YAML → JSON
Convert YAML to JSON format instantly. Supports multi-document YAML and complex configurations.
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CSV → JSON
Convert CSV to JSON array instantly. Automatic header detection and type inference.
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JSON → CSV
Convert JSON array to CSV format instantly. Handles arrays of objects with automatic header extraction.
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Base64 Encode
Encode any text to Base64 instantly. Full UTF-8 support, runs entirely in your browser.
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Base64 Decode
Decode Base64 strings back to plain text instantly. Full UTF-8 support, runs entirely in your browser.
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URL Encode
URL-encode any text instantly with percent-encoding. Supports Unicode and all special characters.
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URL Decode
Decode URL-encoded percent sequences back to plain text instantly. Supports all encoded characters.
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JSON Formatter
Format and validate JSON instantly. Detects syntax errors and pretty-prints with 2-space indentation.
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Case Converter
Convert text to camelCase, PascalCase, snake_case, kebab-case, and more — all at once.
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JWT Decoder
Decode JWT tokens instantly. Inspect header and payload client-side — your token never leaves the browser.
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HTML → Markdown
Convert HTML to clean Markdown instantly. Supports headings, links, lists, tables, and code blocks.
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Unix Timestamp
Convert Unix timestamps to UTC, local time, and ISO 8601 instantly. Auto-detects seconds vs milliseconds.
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Base Converter
Convert numbers between decimal, hex, binary, and octal instantly. Free and runs in your browser.
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Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly. Runs entirely in your browser using the Web Crypto API.
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HMAC Generator
Generate HMAC-SHA-256, SHA-384, and SHA-512 signatures instantly. Uses the Web Crypto API — your data never leaves the browser.
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Color Converter
Convert HEX, RGB, RGBA, HSL, and HSLA colors instantly. Supports named CSS colors and alpha channels.
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JSON → TypeScript
Generate TypeScript interfaces from JSON instantly. Supports nested objects, arrays, and automatic type inference.
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XML → JSON
Convert XML to JSON instantly. Handles attributes, nested elements, and repeated tags as arrays.
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JSON → XML
Convert JSON to XML format instantly. Handles nested objects and arrays — runs entirely in your browser.
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JSON Diff
Compare two JSON objects and highlight differences instantly. Color-coded diff with added/removed line counts — runs in your browser.
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Text → Hex
Convert plain text to hexadecimal bytes instantly. Full UTF-8 support, runs entirely in your browser.
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Text → Binary
Convert plain text to binary instantly. Each byte as an 8-bit group, full UTF-8 support — runs in your browser.
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Binary → Text
Convert binary back to plain text instantly. Space-separated 8-bit groups, full UTF-8 support — runs in your browser.
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Hex → Text
Convert hexadecimal bytes back to plain text instantly. Supports spaced or continuous hex input.
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Slug Generator
Generate SEO-friendly URL slugs from any text instantly. Removes special characters and converts spaces to hyphens.
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ROT13
Encode or decode text with ROT13 instantly. Self-inverse cipher — apply twice to get back the original.
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UUID Generator
Generate random UUID v4 values instantly. Generate up to 25 at once, copy individually or all at once.
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Roman Numerals
Convert between Roman numerals and decimal numbers instantly. Enter a number or Roman numeral and get the result.
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Word Counter
Count words, characters, sentences, and paragraphs instantly. Includes reading time and speaking time estimates.
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Number → Words
Convert numbers to English words instantly. Supports up to 999 trillion, including negatives — runs in your browser.
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Image → Base64
Convert images to Base64 data URIs instantly. Supports PNG, JPG, GIF, WebP, SVG. Files never leave your browser.
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Text Diff
Compare two texts and highlight differences instantly. Line diff and word diff modes — runs entirely in your browser.
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Regex Tester
Test regular expressions instantly. Highlights matches and shows capture groups. Supports g, i, m, s flags.
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Cron Parser
Parse cron expressions and get a plain-English description plus next 5 execution times instantly.
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HTML Entity Encode
Encode &, <, >, ", and ' to HTML entities instantly. Prevents XSS — runs entirely in your browser.
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HTML Entity Decode
Decode HTML entities back to plain text instantly. Supports named, numeric, and hex references.
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Lorem Ipsum
Generate Lorem Ipsum placeholder text instantly. Choose paragraphs, sentences, or words — runs in your browser.
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Password Generator
Generate secure random passwords instantly. Custom length and character sets — uses crypto.getRandomValues(), never leaves your browser.
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Line Sorter
Sort, reverse, deduplicate, or shuffle lines of text instantly. Shows duplicate count removed — runs in your browser.
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Morse Code
Convert text to Morse code or decode Morse back to text instantly. Auto-detects direction — runs in your browser.
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CSS Minifier
Minify and compress CSS instantly. Removes comments and whitespace — shows percentage saved. Runs in your browser.
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TOML → JSON
Convert TOML to JSON instantly. Supports all TOML v1.0 features — tables, arrays, inline tables, and more.
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SQL Formatter
Format and pretty-print SQL queries instantly. Uppercase keywords, proper indentation — runs in your browser.
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JWT Encoder
Create and sign JWT tokens instantly. Supports HS256, HS384, HS512 — your secret never leaves the browser.
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URL Parser
Parse any URL into protocol, hostname, port, path, query params, and hash instantly — runs in your browser.
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Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly. Enter any temperature and get all three units at once.
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Duration Converter
Convert seconds to HH:MM:SS, day/hour/minute breakdown, and verbose text instantly — runs in your browser.
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QR Code Generator
Generate QR codes from any text or URL instantly. Choose size and error correction level, download as PNG.
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Text → NATO
Convert text to NATO phonetic alphabet instantly — Alpha, Bravo, Charlie. Supports letters, numbers, and spaces.
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HTML Minifier
Minify and compress HTML instantly. Removes comments and whitespace — shows percentage saved. Runs in your browser.
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Byte Converter
Convert between B, KB, MB, GB, TB, and PB instantly. Select input unit and see all values at once — runs in your browser.
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Aspect Ratio
Calculate aspect ratio from width and height instantly. Get simplified ratio, decimal, and closest common format — 16:9, 4:3, 1:1 and more.
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Percentage Calc
Calculate percentages instantly — X% of Y, A is what % of B, % change, increase/decrease. All in one tool.
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String Reverse
Reverse any string character by character instantly. Full Unicode and emoji support — runs entirely in your browser.
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Pig Latin
Translate English text to Pig Latin instantly. Handles consonant clusters and vowel-starting words — runs in your browser.
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Leet Speak
Convert text to Leet Speak (1337) instantly. Replace letters with numbers — A→4, E→3, O→0 — runs in your browser.
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Text Repeater
Repeat any text multiple times with a custom separator — new line, space, comma, or none. Runs in your browser.
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Text Truncator
Truncate text to a character or word limit instantly. Choose ellipsis style and see what was removed — runs in your browser.
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Text Padding
Pad lines to a fixed width with a custom character. Left, right, or center alignment — runs in your browser.
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Number → Ordinal
Convert numbers to ordinal suffixes instantly — 1st, 2nd, 3rd, 11th, 21st. Handles all edge cases — runs in your browser.
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Sentence Splitter
Split paragraphs into individual sentences instantly. Output as lines, numbered list, or bullet points — runs in your browser.
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Diacritic Remover
Remove accents and diacritics instantly — ü→u, é→e, ñ→n, ç→c and more. Runs entirely in your browser.
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Unicode Normalize
Normalize text to NFC, NFD, NFKC, or NFKD instantly. Fix encoding inconsistencies — runs entirely in your browser.
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HTML → Plain Text
Strip all HTML tags instantly. Removes scripts, styles, and markup while preserving readable text — runs in your browser.
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Strip Markdown
Remove all Markdown formatting instantly — headers, bold, italic, links, code blocks. Returns clean plain text.
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Smart Quotes
Convert straight quotes (" ') to smart curly quotes (“” ‘’) and back. Runs in your browser.
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Typographic Replace
Replace -- with em dash, ... with ellipsis, (c) ©, >= ≥ and more. Proper typography in one click.
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Whitespace Normalizer
Trim lines, collapse spaces, and remove blank lines instantly. Five normalization modes — runs in your browser.
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Find & Replace
Find and replace text instantly with plain text or regex. Case-insensitive mode, shows replacement count — runs in your browser.
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Fancy Text
Generate bold, italic, script, monospace, and more Unicode text styles instantly. Copy each style with one click.
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Superscript Text
Convert text to Unicode superscript characters instantly — perfect for footnotes and exponents. Runs in your browser.
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Upside Down Text
Flip text upside down instantly using Unicode characters. Copy and paste anywhere — runs in your browser.
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Image Compare
Compare two images with a draggable before/after slider in your browser. No upload required.
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Image Cropper
Crop any image in your browser by selecting a region with your mouse. Download as PNG — no upload required.
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Image → ASCII
Convert any image to ASCII art instantly in your browser. Adjust width, copy or download — no upload required.
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Color Palette
Extract dominant colors from any image instantly in your browser. HEX + RGB values — no upload required.
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Image Metadata
Read EXIF metadata from any image in your browser. Camera, GPS, date, exposure — no upload required.
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Flip & Rotate
Flip and rotate images in your browser. Supports 90°/180°/270° rotation and horizontal/vertical flip — no upload required.
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TSV → JSON
Convert tab-separated values to JSON instantly in your browser — no data leaves your device.
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JSON → TSV
Convert JSON arrays to tab-separated values instantly in your browser — no data leaves your device.
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JSON → HTML Table
Convert JSON arrays to HTML table markup instantly in your browser — no data leaves your device.
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cURL → Fetch
Convert cURL commands to JavaScript fetch() code instantly in your browser.
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MIME Type Lookup
Look up MIME types by file extension or search by content type. Complete web format reference.
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Markdown Table
Generate Markdown tables from a visual editor. Set rows, columns, fill cells, and copy — runs in your browser.
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Character Map
Browse Unicode characters by block and copy any character with one click. Runs in your browser.
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String Escape
Escape or unescape strings for JSON, JavaScript, SQL, and Regex — runs in your browser.
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Unit Converter
Convert length, weight, area, volume, speed, temperature, and data units instantly in your browser.
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Timezone Converter
Convert times between world time zones instantly in your browser. Supports all major IANA zones.
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Image Resizer
Resize any image to exact dimensions instantly in your browser. PNG, JPG, WebP output — no upload required.
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Image Format Converter
Convert images between PNG, JPG, and WebP formats in your browser. Adjust quality — no upload required.
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Image Compressor
Compress images instantly in your browser with a quality slider. Before/after file size shown — no upload required.
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Image Filter
Apply grayscale, sepia, invert, and brightness filters to images in your browser. Download as PNG — no upload required.
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