Free Online Tools — zxzx.app
zxzx.app Tools is a collection of 22 free, browser-based utility tools for image conversion, PDF manipulation, developer utilities, and text processing. All operations run locally in your browser — your files are never uploaded to any server.
Image Tools
Image Converter — Convert images between JPG, PNG, WebP, GIF, and BMP formats with adjustable quality settings. Supports drag-and-drop upload and instant preview with file size comparison.
Image Compressor — Reduce image file size with a quality slider. Batch processing supported. Output in JPG, PNG, or WebP.
Image Resizer — Resize images to custom dimensions with aspect ratio lock. Supports pixel, percentage, and millimeter units.
Circular Crop — Crop images into perfect circles with transparent, white, or custom color backgrounds. Export as PNG.
EXIF Remover — Strip all EXIF metadata from photos including camera info, GPS coordinates, and timestamps. Compare before/after file sizes.
PDF Tools
Merge multiple PDFs, split by page range, compress image-heavy PDFs, and reorder pages with drag-and-drop thumbnails. All processing happens in your browser using pdf-lib.
Developer Tools
Generate and read QR codes, create Code128 barcodes, pick colors with RGB/HSL/HEX conversion, and convert between measurement units (length, weight, temperature, volume).
Text Tools
Count characters, words, and reading time. Generate secure passwords with strength indicators. Compute SHA-256/SHA-512/MD5 hashes. Encode/decode URLs and Base64. Compare texts side-by-side with diff highlighting. Run precision stopwatches and countdown timers.
Frequently Asked Questions
Are my files uploaded to a server?
No. All image conversion, PDF processing, and data manipulation happens entirely in your browser using JavaScript. Your files never leave your device.
What file formats are supported?
Image tools support JPG, PNG, WebP, GIF, and BMP. PDF tools support standard PDF files. There is a 20MB file size limit per operation.
Is zxzx.app free to use?
Yes, all tools are completely free with no registration required. There are no watermarks, no file count limits, and no hidden fees.
🔒 Privacy: Processed locally — your files never leave your device.