devTools for the work between systems.
Search all 141 browser tools
Encoding & crypto
13 toolsHTML Entity Encoder
Escape text for inclusion in HTML text content.
Open tool →HTML Entity Decoder
Decode HTML entities into plain text without executing markup.
Open tool →HMAC Generator
Generate HMAC-SHA-256, SHA-384, or SHA-512 using a local secret.
Open tool →Converters
22 toolsXML Formatter
Validate and indent XML while preserving mixed text content.
Open tool →XML Validator
Check XML well-formedness. This does not validate an XSD schema.
Open tool →XML Minifier
Remove indentation-only XML text nodes; preserve mixed content and xml:space.
Open tool →JSON & YAML
18 toolsJSON Stringify
Encode JSON as a quoted JSON string.
Open tool →String to JSON
Decode a JSON string containing a JSON document.
Open tool →JSON Sort Keys
Sort object keys recursively while preserving array order.
Open tool →Text & regex
13 toolsLine Sorter
Sort lines alphabetically with configurable direction and duplicate removal.
Open tool →String Escape / Unescape
Escape text as a JSON string or decode JSON string escapes.
Open tool →UTF-8 Byte Counter
Count UTF-8 bytes, Unicode code points, and UTF-16 code units.
Open tool →CSS & color
9 toolsCSS Unit Converter
Convert px, rem, and em using explicit root and parent font sizes.
Open tool →CSS Beautifier
Format CSS with readable indentation locally.
Open tool →Minify CSS
Remove CSS comments and unnecessary whitespace locally.
Open tool →Generators
7 toolsQR Code Generator
Generate a downloadable QR code locally from text or a URL.
Open tool →Mock Data Generator
Generate synthetic JSON records locally from a sample object and count.
Open tool →Favicon Generator
Create a simple SVG favicon locally from text and a background color.
Open tool →API & networking
10 toolschmod Calculator
Choose owner, group, and other permissions and generate octal and symbolic modes.
Open tool →chmod to English
Explain three-digit octal file permissions.
Open tool →.env Validator
Check simple KEY=value lines and report duplicate keys. No interpolation or shell execution.
Open tool →Date & time
8 toolsISO Week Number
Find the ISO week number and ISO week year for a date.
Open tool →Working Day Calculator
Count weekdays inclusively, excluding optional holiday dates.
Open tool →Unix Timestamp Converter
Convert Unix seconds or milliseconds to dates and dates to timestamps.
Open tool →Images
9 toolsAspect Ratio Calculator
Calculate a reduced aspect ratio and a proportional target height.
Open tool →Image Editor
Crop, resize, rotate, draw, annotate, add text, and apply grayscale, sepia, blur and brightness filters locally.
Open tool →Bulk Image Converter
Convert image formats in bulk with optional resizing and quality controls. Download individual files or a ZIP.
Open tool →PDF tools
12 toolsText to PDF
Create a downloadable text PDF locally.
Open tool →JSON to PDF
Create a downloadable PDF containing formatted JSON.
Open tool →Word → PDF
Convert Word DOCX documents to downloadable PDFs locally in your browser. Best-effort layout with image-based pages; no uploads.
Open tool →Audio tools
10 toolsAudio Converter
Convert browser-supported audio to WAV or MP3 locally.
Open tool →Audio Compressor
Reduce audio size with adjustable MP3 bitrate and channel settings.
Open tool →Audio Trimmer
Trim an audio clip using start and end times, with a downloadable result.
Open tool →Video tools
10 toolsVideo Compressor
Compress video locally and keep the original if the result would be larger.
Open tool →Video Converter
Convert local video files to MP4 or WebM directly in your browser.
Open tool →Video Trimmer
Cut a video to a selected start and end time without uploading it.
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