All converters

Move structured data between JSON, CSV, YAML, XML and SQL.

JSON to CSV

Turn a JSON array into a spreadsheet-ready CSV file.

CSV to JSON

Turn spreadsheet exports into clean JSON objects.

YAML

JSON to YAML

Convert JSON into readable YAML for configs and manifests.

XLSX

XLSX to CSV

Convert an Excel workbook to CSV without uploading it.

YAML

YAML to JSON

Read a YAML config as JSON your tools can parse.

TypeScript

JSON to TypeScript

Generate TypeScript interfaces from a JSON sample.

XLSX

XLSX to JSON

Turn a spreadsheet into JSON records.

Python

JSON to Python

Generate dataclasses or TypedDicts from JSON.

JSON to Go

Generate Go structs with JSON tags from a sample response.

TypeScript

JSON to Zod

Generate a Zod schema that validates your JSON shape.

CSV to Markdown Table

Turn spreadsheet data into a Markdown table.

JSON Schema

JSON to JSON Schema

Infer a JSON Schema document from an example.

JSON to SQL

Generate CREATE TABLE and INSERT statements from JSON.

Query string

URL Query String to JSON

Turn URL parameters into readable JSON.

Rust

JSON to Rust

Generate serde structs from a JSON sample.

XML to JSON

Parse XML documents and feeds into JSON.

ENV

ENV to JSON

Turn a .env file into JSON.

JSON to XML

Wrap JSON data in well-formed XML elements.

CSV to SQL

Load a spreadsheet into a database with generated SQL.

ENV

JSON to ENV

Turn a JSON config object into .env lines.

INI

INI to JSON

Convert INI and config files into JSON.

Query string

JSON to Query String

Build a URL query string from a JSON object.

JavaScript

JSON to JavaScript

Turn JSON into a formatted JavaScript object literal.

CSV to XML

Turn a spreadsheet export into structured XML.

Developer

Formatters, generators and decoders for everyday engineering work.

JSON Formatter

Pretty-print and validate JSON with useful error messages.

HEX

Color Picker

Pick a colour and get HEX, RGB, HSL, OKLCH and contrast ratios.

Cron expression

crontab

Cron Expression Generator

Build a cron schedule, see when it runs, and get the config for it.

HEX

CSS

Color Palette Generator

Build a theme palette and export it as CSS, Tailwind, SCSS or JSON.

package.json

Report

Check Dependencies

Spot hallucinated and typosquatted package names before you install them.

Timestamp

Date breakdown

Unix Timestamp Converter

Read epoch timestamps as dates, and dates as timestamps.

PEM

Details

Certificate Decoder

Read an SSL certificate — who it is for, when it expires, and what it covers.

Circuit

Truth table

Logic Gate Sandbox

Wire up gates, flip the switches, and watch a circuit remember.

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UUID

UUID Generator

Generate cryptographically random UUIDs in bulk.

JWT

JWT Decoder

Read the header and claims inside a JSON Web Token.

Binary

All bases

Number Base Converter

Convert between binary, octal, decimal and hexadecimal.

HEX

Color Converter

Convert between HEX, RGB, HSL, HSV and CMYK.

Query model

SQL Query Builder

Build a SELECT with joins and get JDBC or Python code for it.

JSON Minifier

Strip whitespace to make JSON as small as possible.

Matches

Regex Tester

Test a pattern against real text and see every match.

SQL Formatter

Make long queries readable with consistent keyword layout.

XML Formatter

Indent XML properly, or collapse it onto one line.

Hex digest

Hash Generator

Compute SHA-1, SHA-256, SHA-384 and SHA-512 digests.

CSV Formatter

Clean up delimiters, quoting and ragged rows.

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Lorem Ipsum Generator

Generate placeholder text by word, sentence or paragraph.

Text

Encode, decode, reshape and clean up text of any size.

Text to Base64

Encode any text as Base64, including emoji and accents.

Base64 to Text

Decode Base64 back into readable text.

Markdown to HTML

Render Markdown into clean, safe HTML.

Rich text

Markdown to Rich Text

Paste Markdown, copy formatted text that arrives properly in Word and Docs.

Remove Invisible Characters

Find zero-width spaces, hidden characters and smuggled instructions in text.

Remove Personal Data

Find and replace emails, card numbers and other personal data before text goes near a model.

Encoded URL

URL Encode

Percent-encode text for safe use in URLs.

Encoded URL

URL Decode

Turn percent-encoded URLs back into readable text.

Diff

Text Compare

See exactly what changed between two versions of a text.

Case Converter

Switch text between camelCase, snake_case, Title Case and more.

HTML to Markdown

Convert web page markup into clean Markdown.

Slug

Text to Slug

Make URL-friendly slugs from titles and headings.

HTML entities

HTML Encode

Escape HTML so markup shows as text instead of rendering.

HTML entities

HTML Decode

Turn HTML entities back into the characters they represent.

Hex

Text to Hex

Convert text into its hexadecimal bytes.

Hex

Hex to Text

Decode hexadecimal bytes back into readable text.

HTML to Text

Strip tags and keep the readable content.

Statistics

Word & Character Counter

Count words, characters, sentences and reading time.

Remove Duplicate Lines

Deduplicate and tidy a list of lines.

Images

Change image formats, resize and compress without uploading anything.

JPG to PNG

Convert JPG images to PNG without uploading them.

PNG to JPG

Convert PNG images to JPG without uploading them.

Crop Image

Drag a box over your photo and cut out the part you want.

Image Compressor

Shrink image files towards a target size.

Image Resizer

Scale images to an exact size or a percentage.

WebP to PNG

Convert WebP images to PNG without uploading them.

ZIP

Favicon Generator

Turn one image into a complete favicon set with manifest and markup.

Screenshot Beautifier

Put a screenshot on a background with padding, rounded corners and a shadow.

Any image

Image to Base64

Turn an image into a data URL you can paste into code.

JPEG

Remove EXIF (Metadata) Data from a Photo

Strip location and camera data from a photo without recompressing it.

MP4

GIF

Video to GIF

Trim a video down to the good bit, and save it as a GIF or a shorter clip.

PNG to WebP

Convert PNG images to WebP without uploading them.

Redact a Screenshot

Cover names, emails and anything else in a screenshot before you share it.

Prompt

AI Image Metadata Viewer and Remover

Read the prompt, settings and workflow hidden in a generated image — or strip them out.

Base64 to Image

Decode a Base64 string back into a downloadable image.

Low Poly & Stained Glass

Turn a photo into flat triangles, or into a stained glass window.

JPEG

EXIF Viewer

See the hidden metadata in a photo, including where it was taken.

WebP to JPG

Convert WebP images to JPG without uploading them.

Film Negative to Positive

Turn a scanned colour negative into a proper photograph, orange mask and all.

JPG to WebP

Convert JPG images to WebP without uploading them.

ICO

PNG to ICO

Convert an image to a multi-size Windows .ico file.

Hide a Message in an Image

Tuck a message into the pixels of a picture, and read it back later.

SVG

SVG to PNG

Convert SVG images to PNG without uploading them.

HEIC

HEIC to JPG

Convert HEIC images to JPG without uploading them.

GIF

GIF to PNG

Convert GIF images to PNG without uploading them.

BMP

BMP to PNG

Convert BMP images to PNG without uploading them.

Audio

Convert and extract audio from files you already have, without uploading them.

MP4

MP4 to MP3

Pull the audio track out of a video as an MP3.

Audio to MP3

Convert any audio file your browser can play into an MP3.

WAV to MP3

Compress bulky WAV recordings into shareable MP3 files.

M4A

M4A to MP3

Convert Apple M4A and AAC audio to MP3.

MP3 to WAV

Decode an MP3 into an uncompressed WAV file.

OGG

OGG to MP3

Convert OGG Vorbis and Opus audio to MP3.

FLAC

FLAC to MP3

Convert lossless FLAC files into portable MP3s.

Audio to WAV

Convert any audio into uncompressed 16-bit WAV.

Subtitles

Convert and retime caption files for video players and editors.

Audio to Subtitles

Generate SRT or VTT subtitles from speech, without uploading the audio.

MP4

Video to Subtitles

Create subtitles for a video file, entirely on your own device.

VTT

SRT to VTT

Convert SubRip subtitles to WebVTT for HTML5 video.

VTT

VTT to SRT

Convert WebVTT captions to SRT for players and editors.

Subtitle to Text

Strip the timings and keep the transcript.

Subtitle Sync

Fix subtitles that run early, late or drift out of sync.

Documents

Turn text, Markdown and images into documents you can share.

Merge PDF

Combine several PDFs into one, in the order you choose.

PDF to Text

Pull the text out of a PDF, without uploading it.

PDF to JPG

Turn PDF pages into JPG images.

Split PDF

Pull out a page range into a new PDF.

Images to PDF

Combine photos or scans into one multi-page PDF.

Image to PDF

Wrap a photo or scan in a PDF page.

PDF to PNG

Render PDF pages as lossless PNG images.

Compare Two PDFs

See exactly what changed between two versions of a document.

Remove PDF Pages

Delete pages you do not want and keep the rest.

Rotate PDF

Turn sideways or upside-down pages the right way up.

Print-and-Play Card Sheets

Lay cards out to print and cut, with backs that line up.

PDF Booklet Maker

Reorder a PDF for folded, saddle-stitched booklet printing.

PDF Multiple Pages Per Sheet

Print 2, 4 or more pages on each sheet of paper.

Text to PDF

Turn plain text into a paginated, shareable PDF.

Markdown to PDF

Turn a Markdown document into a PDF you can send.

HTML to PDF

Extract the readable content of HTML into a PDF.

Maker

3D printing tools: mesh measurements, filament costs and scaling.

Drawing

TTF

Draw Your Own Font

Draw the letters, download a real font file, and type in your own handwriting.

Print job

Costs

3D Print Cost Calculator

Work out what a print costs and what to charge for it.

STL

STL Volume Calculator

Measure an STL and estimate the filament it needs.

Anamorphic Illusion Maker

Print a distorted picture that looks right from one spot, and only that spot.

G-code

G-code Analyser

Read a sliced file: time, filament, size and layers.

STL

OBJ

STL to OBJ

Convert an STL mesh to Wavefront OBJ.

Percentage

Scale factors

Model Scale Calculator

Resize a model and see what it does to the material.

Everyday

Kitchen measurements, photo sizes and the small conversions daily life needs.

Settings

Password

Password Generator

Strong passwords and passphrases, with the strength worked out honestly.

List

One item

Spin the Wheel

Put your list on a wheel and spin it to pick one.

Invoice details

Invoice Generator

Build an invoice and download it as a PDF.

Dice notation

Rolls

Dice Roller

Roll any dice, one at a time or a whole handful.

Passport Photo Maker

Crop a photo to passport size and get a printable sheet.

List of names

Pairings

Secret Santa Drawer

Draw Secret Santa names, keep couples apart, and never share an email address.

Ingredient list

Weights

Cups to Grams

Convert a recipe’s cup measures to weights, ingredient by ingredient.

Scramble

Solution

Rubik's Cube Solver

Turn it, scramble it, and watch it solved step by step.

Play

Game

Play Mahjong

A full four-player Chinese mahjong game against three opponents, in your browser.

SVG

Barcode Generator

Make a scannable barcode, or a sheet of them, and print it at the right size.

Position

Verdict

Connect 4 Solver

Play it, or find out what a position is really worth — proved, not guessed.

Measurements

Measure Things in a Photo

Put a bank card in the shot and measure anything else in the picture.

°C

Oven Temperature Converter

Convert between °C, °F, gas mark and fan oven settings.

Tonight's Sky

What is up tonight where you are, which way to look, and when it gets dark.

Recipe

Recipe Scaler

Resize a recipe for a different number of people.

Hand

Analysis

Mahjong Hand Calculator

How close your hand is, what it is waiting on, and what to throw away.

Solve a Maze from a Photo

Photograph a maze and watch the way through drawn onto it.

Sing the Note

It plays a note, you sing it back, and it tells you how close you were.

Learn Keyboard Shortcuts

Drill the shortcuts for the app you actually use, until your fingers know them.

Other

Everything else that did not fit neatly in a box.

QR Code Generator

Turn a link or any text into a QR code, as PNG or SVG.

Contents

QR Code Reader

See where a QR code goes before you follow it.

Network name

WiFi QR Code

Let guests join your network by pointing a camera at it.

Date

SVG

Star Chart Poster

The sky exactly as it stood over one place, on one night.

Keyboard

Result

Keyboard Test

Press every key and see which ones actually register.

Any file

Send a File Directly

Move a file straight from one device to another, with no upload and no account.

Recovery kit

Dead Man's Switch

Leave a message only several people together can open — no company holding your key.

Display

Result

Dead Pixel Test

Fill the screen with flat colour to find dead and stuck pixels.

Mouse

Result

Mouse Test

Check every button, the scroll wheel, and whether your mouse is double-clicking.

Microphone

Pitch

Voice Pitch & Resonance Trainer

See your pitch and resonance as you speak, and track them over months.

ZIP

Listing

ZIP Inspector

See what is inside a ZIP without extracting it, and what it would do if you did.