File & Image Utilities
32 in-browser tools for PDF editing, image optimization, document conversion, and live previews.
Image Tools
Compress, resize, convert and edit images entirely in your browser.
Image to PDF
Combine multiple images into a single PDF file.
Image Compressor
Shrink image file size with a quality slider.
Image Resizer
Resize images by pixels or percentage.
Image Cropper
Crop images visually and download instantly.
Image Format Converter
Convert between JPG, PNG, WebP and BMP.
Image to Base64
Encode images to Base64 — or decode back to an image.
Image Watermark
Add a text watermark with position and opacity controls.
PDF Tools
Merge, split, compress and convert PDF files — privately on your device.
PDF Merger
Merge multiple PDFs into one in any order.
PDF Splitter
Extract pages from a PDF by range.
PDF to Images
Convert PDF pages to images and download as ZIP.
PDF Page Counter
Count pages, view size and metadata of a PDF.
PDF Compressor
Reduce the size of any PDF document.
Text to PDF
Turn plain text into a downloadable PDF.
PDF to Word
Convert PDF content to an editable Word (.docx) file.
Word to PDF
Convert Word (.docx) documents to PDF format.
Converter Tools
Convert between CSV, JSON, HTML, Markdown, Excel and more.
CSV to JSON
Convert CSV files or pasted CSV into JSON.
JSON to CSV
Convert JSON arrays to a downloadable CSV.
JSON Formatter
Beautify or minify JSON with one click.
HTML to Text
Strip HTML tags and extract plain text.
Markdown to HTML
Live preview Markdown rendered to HTML.
Markdown Live Preview & Editor
Real-time Markdown editor with split live preview, HTML export, and cheat sheet.
Excel to JSON
Convert .xlsx or .xls sheets into JSON.
CSS Minifier
Minify CSS code to reduce file size and load time.
HTML Minifier
Minify HTML code by stripping comments and extra whitespace.
Utility Tools
Handy everyday tools: QR codes, counters, metadata, favicons and palettes.
QR Code Generator
Generate a QR code from any URL or text.
QR Code Reader
Decode a QR code from an uploaded image.
File Size Converter
Convert between B, KB, MB, GB and TB.
Word & Character Counter
Count words, characters, sentences and reading time.
File Metadata Viewer
Inspect file size, type, dimensions and EXIF data.
Favicon Generator
Generate favicons in all sizes from an image or text.
Color Palette from Image
Extract dominant colors from any image.
Color Converter
Convert between HEX, RGB, and HSL with a live color picker.
Client-Side Document & Image Processing Explained
Handling digital assets, modifying PDF contracts, and optimizing web graphics are daily tasks for modern digital professionals. However, traditional web tools require uploading your sensitive files to cloud servers where they are saved to disk and processed asynchronously.
At Toolkit by NS Ascertain, we utilize WebAssembly (WASM) and client-side JavaScript libraries (such as PDF-Lib and Canvas API) to execute all document manipulation locally. When you merge PDFs, compress JPEG photos, or generate custom QR codes, every operation happens within your device's isolated browser memory space.
Complete File Confidentiality
Zero file uploads. Confidential documents never leave your laptop or phone.
Native System Speed
Instant document rendering powered directly by your device CPU.
Unlimited Free Operations
No daily quotas, watermarks, or subscription paywalls.
Featured File Processing Guide
How to Merge PDF Files Online Privately (Zero File Uploads)
Combine multiple PDF documents into a single file directly in your web browser. 100% private, instant, and free.
Frequently Asked Questions
Are my PDF files or image uploads uploaded to your servers?
No. All PDF merging, splitting, image compression, image resizing, and file conversions occur 100% client-side inside your browser tab using WebAssembly and PDF-Lib. Your files never touch a remote server.
Is there any file size limit for merging PDFs or compressing images?
Because processing utilizes your system's hardware RAM and CPU directly, there are no artificial server file size limits. You can process large documents as fast as your system allows.
Which image formats can I convert or compress?
Toolkit supports popular Web formats including JPEG, PNG, WebP, GIF, SVG, and ICO for resizing, compression, palette extraction, and conversion.
Can I preview Markdown files live before publishing?
Yes! Our Markdown Live Preview tool provides a side-by-side real-time split editor with HTML export, word count stats, and instant styling.