Every devtool you need, in one fast page.

Base64 Encode / Decode

Encode text to Base64 or decode back instantly.

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URL Encoder & Query Parser

Encode/decode URLs, inspect query params.

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JWT Decoder

Decode header & payload, check expiry.

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HTML Entities Encoder

Escape & decode HTML characters.

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ROT13 & Caesar Cipher

Shift letters, decode ROT13 instantly.

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Morse Code Translator

Text ↔ Morse with auto-detect.

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URL Slug Generator

Titles → clean URL slugs.

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Text to Binary / Hex Converter

Text ↔ binary, octal, decimal, hex bytes.

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Base32 Encode / Decode

RFC 4648 Base32, TOTP-compatible.

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Hexdump Viewer

Text/files → classic hex + ASCII.

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Unicode Inspector

Codepoints, UTF-8 bytes, normalization.

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Gzip + Base64 Compressor

Shrink text, paste-safe output.

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Authenticator (TOTP Codes)

6-digit 2FA codes from secrets.

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Vigenère Cipher

Keyed classic cipher, both ways.

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JSON Formatter & Validator

Prettify, minify, validate, sort keys.

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SQL Formatter & Checker

Format, minify, validate SQL queries.

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Regex Tester

Test patterns live with match highlight.

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Text Case Converter

camelCase, snake_case, Title + word count.

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Color Converter

HEX ↔ RGB ↔ HSL, contrast + palettes.

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Markdown Preview & Export

Write markdown, preview + export HTML.

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XML Formatter & Validator

Prettify, minify, find tag errors.

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Chmod Calculator

Click permissions → octal + symbolic.

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Number Base Converter

Binary, octal, decimal, hex + ASCII.

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Curl Converter (curl ↔ Code)

curl to code & CLI (wget, httpie, PowerShell) + builder.

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CSS Formatter & Minifier

Prettify or minify stylesheets.

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TOML ↔ JSON Converter

Convert TOML configs to JSON and back.

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INI ↔ JSON Converter

Convert INI configs to JSON and back.

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Phone Number Formatter

Any format → E.164 + national.

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Card Number Checker (Luhn)

Validate numbers, detect brand, mask.

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Number to Words Converter

1234567 → one million…

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Table Generator (Markdown/ASCII/HTML)

CSV → pretty tables.

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.env ↔ JSON Converter

Env files to JSON and back.

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JSON → TypeScript / Schema

JSON to TS interfaces + JSON Schema.

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Java .properties ↔ JSON

Properties files to JSON and back.

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Markdown TOC Generator

Headings → GitHub TOC with anchors.

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GraphQL Formatter & Minifier

Prettify queries, strip to one line.

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HTML Formatter & Minifier

Prettify markup or crush it.

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String Escaper (JS/JSON/Regex/Shell)

Escape strings for 6 targets.

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Text Column Aligner

Align on : = # delimiters.

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Find & Replace (Regex)

Bulk replace with live count.

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JSONPath Evaluator

Query JSON with $ paths.

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XML ↔ JSON Converter

XML to JSON (@attrs, #text) and back.

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Delimiter Converter (delim.co alternative)

Convert CSV, TSV, pipes, custom delimiters.

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Timestamp Converter

Unix time ↔ human date, ISO, UTC.

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JSON Diff Checker

Compare two JSONs, highlight added/removed/changed.

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JSON to CSV Converter

Flatten JSON arrays to CSV/TSV download.

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Text Diff Checker

Line diff for any two texts.

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YAML ↔ JSON Converter

Convert YAML to JSON and back.

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CSV Viewer & Table

View CSV as sortable searchable table.

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Line Toolkit: Sort & Dedupe

Sort, dedupe, number, affix lines.

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SEO Checker (HTML Audit)

Paste HTML → instant SEO audit.

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CSV to JSON Converter

CSV rows → JSON array, typed values.

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List Shuffler & Random Picker

Shuffle lines, pick N winners.

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Word Counter & Text Stats

Words, reading time, top words.

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Date Calculator

Date diffs + add/subtract days.

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Fake Data Generator (CSV)

Names, emails, phones → test CSV.

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Unit Converter

Length, weight, temp, data sizes.

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Subnet Calculator (IPv4 CIDR)

CIDR → range, mask, hosts.

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World Clock

Live times across zones.

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HMAC Generator (SHA)

Keyed hashes, hex/base64.

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UUID Inspector & Validator

Version, variant, timestamps.

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DNS Lookup (DoH)

A/AAAA/MX/TXT/CNAME from browser.

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HTTP Status Code Lookup

26 codes, what to do each.

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MIME Type Lookup

50+ extensions ↔ content types.

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Emoji Picker (Click to Copy)

64 dev-useful emoji, searchable.

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Dice Roller & Coin Flip

Crypto-random dice + history.

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Bill Splitter + Tip

Split bills, tip math done.

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Percentage Calculator

X% of Y, reverse %, change %.

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Loan / Mortgage Calculator

Payments + yearly balance chart.

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Age Calculator

Exact age + next birthday countdown.

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Mock API Server (HTTP/RPC)

Custom URL + method + status + auth middleware, ephemeral.

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Webhook Inbox & Tester

Paste URL to provider, inspect payloads, custom replies.

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Mermaid Diagram Editor

Live flowchart/sequence/etc editor, 6 themes, local render.

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PlantUML Diagram Editor

Sequence/class/activity editor, 20 themes, local history.

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gRPC Mock Server (grpcurl)

Upload .proto, auto-mock every RPC, call with grpcurl.

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Image Compressor

Shrink JPG, PNG, WebP locally.

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Image Crop & Resize

Crop to aspect ratio, resize, export.

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Background Remover

Remove photo background with AI, locally.

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Image to Base64 / Base64 to Image

Encode images to data URIs, decode back.

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Image Downloader & Resizer

Fetch by URL, resize, convert, download.

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Favicon Generator

PNG logo → multi-size icons + .ico.

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Aspect Ratio Calculator

Ratios + locked scaling.

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SVG Optimizer

Shrink SVGs, live preview.

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Image Color Palette Extractor

Photo → dominant HEX colors.

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Image Metadata Viewer

Dimensions, size, aspect, MP.

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Image Rotate / Flip / Filter

Rotate, mirror, grayscale, invert.

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QR Code Reader

Upload QR → text/URL.

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EAN-13 Check Digit

Compute + validate barcodes.

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Image Splitter (Tiles)

Slice images into grids.

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Meme Generator

Top/bottom Impact text, export.

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Before / After Compare Slider

Drag-to-reveal image diff.

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Image Watermark Adder

Text watermark, 9 positions, export.

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Video Downloader & Editor

Multi-link fetch + trim, watermark, resize.

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Tone Generator & WAV Download

Sine/square/saw tones, export .wav.

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Voice Recorder (Mic → File)

Record mic, download audio.

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Metronome (30–240 BPM)

Click track + tap tempo.

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Video Metadata Inspector

Duration, res, bitrate, thumbnail.

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Audio Trimmer → WAV

Waveform select, cut, export.

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Subtitle Converter (SRT ↔ VTT)

Subtitles both ways + download.

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Video Thumbnail Capture

Scrub → frame → PNG.

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Screen Recorder → WebM

Tab/screen capture, download.

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Audio Joiner → WAV

Merge up to 10 clips, one file.

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Noise Generator (White/Pink/Brown)

Focus sounds + WAV download.

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Hash Generator (SHA)

SHA-256, SHA-384, SHA-512 in browser.

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UUID Generator (v1–v7)

Bulk UUIDs v1 v3 v4 v5 v6 v7 + nil.

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ULID Generator & Decoder

Sortable 26-char IDs + timestamp decode.

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Password Generator

Strong random passwords, bulk + entropy.

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QR Code Generator

Text/URL to QR, PNG + SVG download.

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Lorem Ipsum Generator

Dummy text by paragraphs/sentences.

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Cron Expression Builder

Build cron + plain-English preview.

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Sitemap.xml Generator

URL list → sitemap.xml download.

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Meta Tag Generator

SEO + OG tags with SERP preview.

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CSS Gradient Generator

Linear/radial gradients, live preview.

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Box-Shadow Generator

Layered shadows, live preview.

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.gitignore Generator

Stacks → combined gitignore.

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Nano ID Generator

Short crypto IDs, custom alphabets.

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README Generator

Inputs → markdown README.

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Open-Source License Generator

MIT/Apache/GPL + 3 more, dated.

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Test Card Numbers (Sandbox)

Luhn-valid fake PANs + exp/CVC.

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Placeholder Image Generator

Sized PNGs with labels.

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CSS Pattern Generator

Dots, grids, stripes, checkers.

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App Icon Set Generator

One upload → 14 sizes PNG.

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robots.txt Builder

Rules + sitemap, download.

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security.txt Generator (RFC 9116)

Vulnerability disclosure file.

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Conventional Commit Builder

Types, scopes, lint hints.

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