More Developer Tools

233 free more developer tools tools in the Developer Tools collection — every one runs in your browser with no signup and no uploads. Page 1 of 3.

Merge PDF

Combine multiple PDFs into one, drag to reorder, download — nothing uploaded.

Cron Expression Explainer

Translate any cron expression into plain English — and build your own.

Accent Fold (Search Normaliser)

Fold accented letters to ASCII base for search matching

Adler-32 Checksum Calculator

Fast Adler-32 checksum as used in zlib, PNG, and the deflate format

Android APK Inspector

Inspect an APK's manifest, permissions and version code in your browser

BPM Detector

Detect beats-per-minute of an audio file using Web Audio API analysis

Audio Waveform Viewer

Visualise a WAV or MP3 waveform locally — no upload, no flash

AWS IAM Global Condition Keys

All aws:* global IAM condition keys with type, description and example use.

Base-N Arithmetic Calculator

Add, subtract, multiply in any base from 2 to 36

BiDi / RTL Text Inspector

Reveal hidden Unicode BiDi control characters in text or filenames.

Binary File Inspector

Inspect any binary: extracted strings, byte histogram and entropy heatmap.

Bit Parity Calculator

Determine even/odd parity of any integer's bit string

Bit Population Count (popcount)

Count the number of set (1) bits in any integer

Bit Shift Calculator

Left-shift and right-shift integers, with logical and arithmetic modes.

Bitwise Calculator

Compute AND, OR, XOR and NOT on integers in decimal, hex or binary.

Blender Keyboard Shortcuts

Blender 3D shortcuts filterable by editor, mode and action

BMP / ICO File Inspector

Inspect BMP DIB header and ICO directory — size, bit depth, color planes

BOM Add / Remove Tool

Insert or strip the UTF-8 BOM (EF BB BF) from text

Browser Fingerprint Preview

See what fingerprinting signals your browser exposes — without sending any data anywhere

World Capital Cities Lookup

Find the capital city for any country instantly.

Adler-32 Checksum Calculator

Compute the fast Adler-32 rolling checksum

Fletcher-16 Checksum Calculator

Compute the Fletcher-16 error-detection checksum

Fletcher-32 Checksum Calculator

Compute the Fletcher-32 error-detection checksum

Chemical Element Groups & Families

Browse elements by group: metals, nonmetals, metalloids, halogens

Chrome DevTools Shortcuts

Every Chrome DevTools keyboard shortcut, filterable by panel and OS

Cologne Phonetics (Kölner Phonetik)

German-optimised phonetic encoding for name matching

Common nginx Location Block Patterns

nginx exact, prefix, regex and longest-prefix location match priority rules.

Content-Type Lookup

Find the right MIME content-type by format name, extension, or type tree.

Cookie Inspector & SameSite Auditor

List this page's cookies and audit a pasted Set-Cookie header for security flags

Country Code TLD Lookup

Find the ccTLD domain extension for any country

CSP Violation Report Fields

All CSP violation report JSON fields with Report-To and Reporting API context.

curl HTTP Version Flags

curl --http1.0, --http1.1, --http2, --http3 flags with ALPN and protocol notes

DNS Zone File Parser

Parse BIND-format DNS zone files and display records as a structured table.

DNS Response Codes (RCODE)

Look up DNS RCODE values with meaning and common diagnostic context.

DOCX Metadata Viewer

Read a Word document's author, dates and revision count without opening Word.

Drill & Tap Size Chart

Find the correct drill size for any tap thread

Driving Side by Country

Find out if a country drives on the left or right.

DST Transition Date Finder

Find daylight saving start/end dates for any timezone and year

EBML / Matroska Inspector

Inspect MKV / WebM container structure and track metadata locally

Email Header Analyzer

Paste raw email headers and get SPF, DKIM, DMARC results and routing hops

Emoji Search

Search all Unicode emojis by name, keyword, category or code point.

Endianness Swapper

Reverse byte order to convert between big-endian and little-endian hex.

Browser Entropy Source Tester

Verify that crypto.getRandomValues works in the current browser environment

Envoy HTTP Filter Phases

Envoy filter chain phases and well-known HTTP filter names with order.

EPUB Metadata Viewer

Read title, author, ISBN, and cover from an EPUB file locally.

Excel Formula Parser & Explainer

Paste an Excel formula and get a tree breakdown of what it does

Microsoft Excel Shortcuts

Every Excel keyboard shortcut for Windows and Mac filterable by category.

Figma Keyboard Shortcuts

Search Figma shortcuts by action or key combo for design and dev mode.

File Extension Lookup

Search file extensions to find the format, MIME type, and common apps.

Fiscal Year by Country

Find when the government fiscal year starts and ends by country

Fixed-Width File Parser

Define column widths and parse fixed-width text files to CSV or JSON

FLAC Metadata Viewer

Read FLAC STREAMINFO and Vorbis comment tags locally

Fletcher-16 Checksum Calculator

Compute the Fletcher-16 two-byte checksum for data integrity

Font Metadata Viewer

Read name-table entries — family, version, copyright, licence — from a font file.

Local Font Previewer

Preview a TTF, OTF, or WOFF2 font file locally before installing it.

G-Code Arc (I/J/K) Calculator

Generate G02/G03 I/J center-offset values from start, end, and radius

G-Code Drilling Cycle Calculator

Build G81/G83 canned-cycle blocks for any hole pattern depth and peck size

GCP Region & Zone Codes

All Google Cloud regions and zones with location, multi-region and low-CO2 status.

GitHub Actions Deploy to AWS ECS Workflow

Generate an ECS deploy workflow with ECR push and task definition update

GitHub Actions Deploy to Vercel Workflow

Generate a Vercel deployment GitHub Actions workflow with preview/prod gates

GitHub Actions Docker Build & Publish Workflow

Build and push a Docker image to Docker Hub or GHCR on every push

GitHub Actions Trigger Events

Every GitHub Actions workflow trigger event with activity types and filters.

Gmail Keyboard Shortcuts

Every Gmail keyboard shortcut with action description and category filter.

Go Standard Error Patterns

Browse canonical Go errors from the standard library with package and sentinel values.

Google Sheets Shortcuts

All Google Sheets keyboard shortcuts filterable by category and OS.

GPX Elevation & Distance Stats

Ascent, descent, distance, and pace from any GPX file

GPX Activity Heatmap

Overlay multiple GPX tracks as a heat map — local, no Strava required

GPX Lap Timer

Define a start/finish line in your GPX and auto-detect lap times

GPX Merger

Combine multiple GPX files into one track file in seconds

GPX Route Reverser

Reverse any GPX route or track and download the mirrored file

GPX Splitter

Split a GPX file by point count, time gap, or date boundary

GPX Track Simplifier

Reduce GPX track-point count with Ramer-Douglas-Peucker — keep shape, lose bloat

GPX Viewer

Visualise GPX tracks and waypoints — no account, no upload

GraphQL Introspection Types

GraphQL introspection query shape — __Schema, __Type, __Field and meta-fields.

gRPC Retry Policy Fields

gRPC service config retryPolicy and hedgingPolicy fields with type and behavior.

gRPC Status Codes

All 17 gRPC status codes with numeric value, HTTP mapping and retry guidance.

Hamming Distance Calculator

Count differing bit positions between two binary integers

HAR File Viewer

Browse HTTP Archive .har files and analyze request/response timings.

Homoglyph Detector

Highlight Unicode chars that look like ASCII but aren't

Homoglyph / Lookalike Character Detector

Find visually similar Unicode characters that could be used for phishing.

HTML Form Validation Attributes

required, pattern, min, max, step and the Constraint Validation API in one place.

iframe sandbox Attribute Tokens

All sandbox token values with what capability they re-allow and default block.

HTTP 2xx Success Codes

Deep dive into every HTTP 2xx code with semantics, headers and use cases.

HTTP 3xx Redirect Codes

Every HTTP 3xx redirect with caching behavior, SEO impact and browser handling.

HTTP 4xx Client Error Codes

All 4xx client errors with meaning, common causes and correct response bodies.

HTTP 5xx Server Error Codes

Every 5xx server error with retry semantics, alerting guidelines and recovery notes.

HTTP Authentication Schemes

All HTTP auth schemes — Basic, Bearer, Digest, NTLM — with syntax and security notes.

HTTP Response Header Analyzer

Paste raw HTTP headers and get a security and caching score with fixes.

HTTP Security Headers Grader

Paste response headers and get an A-F security grade with remediation advice.

HTTP Link Relation Types (IANA)

All IANA-registered link relation types with description and spec reference.

HTTP Method Properties Matrix

Safety, idempotency, cacheability matrix for all HTTP methods in one table.

Hue Rotation Calculator

Rotate a color's hue by any degree offset around the color wheel

IATA Airport Code Lookup

Find any major airport by its 3-letter IATA code instantly

ICAO Airport Code Lookup

Look up 4-letter ICAO codes for airports worldwide

ID3 Tag Viewer & Editor

Read and edit MP3 ID3v2 tags — title, artist, album, artwork — locally

bfloat16 Inspector

Inspect Google Brain's 16-bit bfloat16 floating-point format

IEEE-754 Float32 Inspector

Dissect 32-bit floating-point sign, exponent, and mantissa bits

IEEE-754 Float64 Inspector

Dissect the sign, exponent and mantissa bit fields of any 64-bit double.

IEEE-754 Float16 (Half) Inspector

Inspect 16-bit half-precision floating-point bit fields

Adobe Illustrator Shortcuts

All Illustrator shortcuts filterable by category, key and OS.