Free online tools, ready when you are

Format, minify and validate JSON to make API responses easier to read and debug.

Convert Unix timestamps in seconds or milliseconds to dates, or dates to timestamps, for logs and API debugging.

Encode text as Base64 or decode Base64 content to inspect encoded text data.

Encode or decode URLs, paths and query parameters to inspect escaped characters and troubleshoot links.

Compare two texts line by line and highlight additions and deletions for documents and configuration.

Test regular expressions with live match highlighting and capture groups for extraction and validation rules.

Write Markdown with live formatting previews and inspect HTML output for articles and technical documentation.

Count words, characters, lines and UTF-8 bytes to check text length and content limits.

Combine multiple PDF files in your preferred order into one document on your device.

Extract or reorder PDF pages by page number, export a PDF or download individual pages in a ZIP.

Combine JPG, PNG or WebP images into a PDF with custom paper size, orientation and margins.

Reduce image file size by adjusting quality and output format for web uploads and sharing.

Convert images to PNG, JPG or WebP, adjust output quality and download the converted file.

Set image width and height, choose a fit mode and export an image sized for your upload requirements.

Choose an image area, set crop dimensions, preview the result and download the cropped image.

Generate QR codes from text, URLs or WiFi settings, customize the size and export an image.

Read text and links from QR code images, clipboard input or your camera.

Extract text from images and copy the results instead of retyping; recognition models load on first use.

Choose a base color and generate tints, shades and companion palettes for web design.

Generate random passwords with custom lengths and character sets, with strength estimates.

Calculate SHA-1, SHA-256, SHA-384 or SHA-512 hashes from text and copy the digest for verification.

Calculate MD5 or SHA checksums for local files and compare existing hashes to check file integrity.

Generate random UUIDs and validate existing identifiers for database IDs and test data.

Decode JWT headers and payloads to inspect token claims; decoding does not verify signatures.

Generate time-based one-time codes from a secret, view time remaining and test two-factor authentication setup.

Check AI crawler access, page readability and structured data, with evidence and recommendations.

Create website and social sharing images with custom titles, colors and layouts.

Enter a URL to check titles, descriptions, headings and indexing signals, and find on-page SEO issues.

Inspect page titles, descriptions, canonical URLs, Open Graph and Twitter Cards for missing or incorrect tags.

Preview a URL's social card title, description and image, and identify missing sharing metadata.

Look up domain DNS records to check IP addresses, mail servers and domain verification settings.

Look up domain registrars, registration and expiration dates, status and raw WHOIS records.

Look up domain registrars, dates, nameservers and status, and inspect structured RDAP data.

Check DNS resolution and HTTP responses to troubleshoot domain connections and website launch issues.

Identify a domain's likely DNS provider and registrar using nameservers and Domain Connect data.

Generate signed setup links from provider settings and DNS template parameters to test Domain Connect integration.