JavaScript Keycode Tester
Press any key and see event.key, event.code and the modifier state.
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HTML Table Generator
Build an accessible HTML table from pasted data or by hand.
HTML Formatter
Re-indent HTML without breaking whitespace-sensitive elements.
Cookie Parser
Parse Set-Cookie and Cookie headers, and check the security flags.
MongoDB ObjectId Generator
Generate and decode MongoDB ObjectIds, including their embedded timestamp.
String Byte Counter
Measure text in UTF-8 bytes, code points, UTF-16 units and graphemes.
Quoted-Printable Encoder
Encode and decode quoted-printable, the MIME encoding in every email header.
Triangle Calculator
Solve any triangle from three known sides or angles.
Least Common Multiple Calculator
LCM by prime factorisation, listing and the GCF shortcut.
Molarity Calculator
Molarity, moles, mass or volume, plus dilutions.
Social Media Image Size Guide
Every current image size for every major platform.
Add Date Stamp to Photo
Print a date onto a photo, read from its own EXIF.
Photo to Sketch
Turn a photograph into a pencil sketch.
Bubble Text Generator
Turn text into ⓑⓤⓑⓑⓛⓔ letters in circles.
Repeat Text
Repeat every line a set number of times, in place.
Fine-Tuning Cost Calculator
Estimate what a fine-tune costs to train and run, and when it pays for itself.
ASCII Banner Generator
Turn text into a block-letter ASCII banner for a README or a CLI.
Cubic Bezier Generator
Draw an easing curve and see it against the standard ones.
curl to Code Converter
Turn a curl command into working fetch, axios, Python, PHP, Go or Ruby.
Add Watermark to Image
Stamp text or a logo across a photo, tiled or in one corner.
PNG Compressor
Cut PNG file size by reducing the colour palette.
Image to ICO Converter
Make a multi-size .ico file from any image.
BMP to PNG Converter
Convert BMP, TIFF and GIF files to PNG, JPG or WebP.
JPG to AVIF Converter
Convert images to AVIF, the smallest web format available.
PNG to JPG Converter
Turn PNG files into smaller JPEGs with a quality you choose.
Remove Emojis
Strip emoji and their invisible joiners out of any text.
Remove Numbers
Delete digits from text, with the option to keep dates and prices.
Text Repeater
Repeat any text as many times as you need, with your own separator.
Add Line Numbers
Number every line, with padding, a custom start and any separator.
Text to Decimal
Convert text into decimal character codes.
Mirror Text
Reverse text so it reads correctly in a mirror.
Invoice Image Generator
Turn an invoice into a PNG or JPG image for a message, a listing or a preview.
EPS Viewer
Open and preview EPS files in your browser, rendered from the PostScript itself.
Chmod Calculator
Convert file permissions between octal, symbolic and checkboxes.
CSP Generator
Build a Content-Security-Policy header directive by directive.
UUID Decoder
Identify a UUID's version and variant, and extract its timestamp.
ASCII Table
The full ASCII table with decimal, hex, octal, binary and HTML entities.
JSON to Query String
Serialise a JSON object into a percent-encoded URL query string.
Standard Deviation Calculator
Sample and population standard deviation with every step shown.
Mileage Calculator
Mileage reimbursement and the real cost of a trip.
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