Utility

Generate QR codes for links, WiFi, email, or contact cards, and decode any QR code from an uploaded image — all in one tool.

Compress and resize any photo right in your browser — adjust quality, scale dimensions, and export as JPEG, PNG, or WebP.

Length, weight, temperature, volume, area, speed, time, and data storage — all in one converter that updates as you type.

Paste any JSON to beautify, minify, validate with precise error locations, or convert to YAML and CSV — all processed locally.

Generate color harmonies from any base color, and verify WCAG contrast ratios before shipping a design.

Create cryptographically random passwords and check any password's real entropy, crack time, and common weaknesses.

Drag in a file or paste text to instantly compute four hash algorithms side by side, then check them against an expected checksum.

Paste any text and instantly see it in UPPERCASE, camelCase, snake_case, and 5 other formats, with live word and character counts.

Paste a Unix timestamp to get a human-readable date in UTC and your local timezone, or pick a date to get its timestamp in seconds and milliseconds.

Generate realistic-looking fake test data — names, emails, phone numbers, addresses, UUIDs, and safe test card numbers — with CSV and JSON export.

Bidirectional CSV and JSON converter with a full RFC 4180 quoting engine — handles embedded commas, quotes, and line breaks correctly, both ways.

Compare two blocks of text with a real LCS-based diff algorithm — additions, removals, and word-level changes highlighted clearly, line by line.

Upload an image and re-encode it to PNG, JPEG, or WebP with an adjustable quality slider, comparing file sizes before you download.

Create genuine Code128 and EAN-13 linear barcodes client-side, with correct checksum calculation, rendered to canvas and exportable as PNG.

A vanilla-JS Markdown editor with live side-by-side HTML preview — headers, formatting, lists, code blocks, links, and more, no library required.

Upload an image and preview it through published Protanopia, Deuteranopia, Tritanopia and Achromatopsia simulation matrices, computed locally on canvas.

Upload an image to get its full Base64 data URI with a size comparison, or paste a Base64 string to decode it into a viewable, downloadable image.

Paste a block of text, add as many find-and-replace rules as you need, and apply them all in order with per-rule case, whole-word and regex options.

Enter a birth date to get your exact age plus days until your next birthday, or compare any two dates for the difference in days, weeks, months and years.

Store private notes encrypted with AES-GCM and a PBKDF2-derived key — only ciphertext ever touches localStorage, and your passphrase is required every session.

Paste a list of links or labels and generate a full grid of QR codes at once, then download every one as a single ZIP file.

Paste text and instantly see which words matter most, sized by frequency and laid out with zero overlap, ready to export as a PNG.

Convert text to International Morse Code and back instantly, then listen to it played as authentic timed beep tones.

Generate memorable multi-word passphrases using a cryptographically secure random source, with the actual entropy in bits shown — not a made-up score.

Convert file sizes between bytes, KB, MB, GB, TB and PB, showing both binary (1024-based) and decimal (1000-based) results at once.

Create QR codes for URLs, text, emails, WiFi credentials, and vCards. Download as PNG or SVG — no account needed.

Scan pasted text for invisible Unicode characters — zero-width spaces, byte order marks, word joiners — and get a cleaned copy with an exact count of what was found and removed.

Type or paste Markdown and get a live-rendered preview plus copy-ready HTML — headings, bold/italic, lists, links, blockquotes, and inline code, updating as you type.

Encode special characters (<, >, &, quotes) into HTML entities for safe embedding, or decode entities back into readable text — live conversion in both directions.

Paste SVG exported from a design tool and get it genuinely cleaned — comments, editor metadata, and redundant whitespace stripped — with the exact before/after size reduction shown.

Convert straight quotes and double hyphens into proper curly (smart) quotes and em dashes for publishing, or flatten smart typography back to plain ASCII for code, forms, or data — both directions, live.

Paste any line-separated list and remove duplicates while preserving original order — with configurable case-sensitivity and whitespace-trimming for accurate matching.

Generate realistic placeholder names — person names, company names, usernames, or project codenames — in bulk, for mockups, demos, and test data.

Convert any short text into large ASCII block-letter art — for terminal splash screens, code comments, README headers, or README banners, using only plain characters.

Paste a whole list of Unix timestamps or dates — one per line — and get every single one converted at once, seconds or milliseconds, local time or UTC.

Generate themed placeholder text — corporate jargon, pirate speak, cat facts, space opera, or foodie reviews — as a more entertaining alternative to traditional Latin lorem ipsum.

Paste titles or text, one per line, and get real URL-safe slugs — properly normalizing accented characters (café → cafe, not a mangled or stripped result), stripping unsafe characters, and auto-numbering duplicate slugs so a batch conversion never produces two identical URLs.

Define a filename pattern using {n}, {name}, {date}, and {ext} placeholders, and generate a real batch of sequential, correctly zero-padded filenames — with automatic detection if your pattern doesn't actually produce unique names across the batch.

Add campaign or tracking parameters to a base URL and get a correctly built, percent-encoded link using the browser's real URL API — handling spaces, special characters, and existing query parameters correctly, not string concatenation that breaks on edge cases.

Enter an image's original dimensions and a target width or height — get the exact proportional other dimension computed via real cross-multiplication, the simplified aspect ratio via genuine GCD calculation, and a warning when rounding to a whole pixel introduces measurable drift.

Paste any text and get a genuine word-frequency analysis — with real stop-word filtering so common words like 'the,' 'and,' and 'is' don't drown out the actually meaningful, content-carrying words the analysis is meant to surface.