19 tools
Merge, split, compress, organize, protect, sign, watermark, and convert PDFs privately in your browser.
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Private browser tools · 61+ utilities
Convert PDFs, compress images, and format JSON without uploading files. Every tool runs on your device — free, private, and no signup.
Categories
Popular tools
Instant · PrivateMerge PDF
Combine multiple PDF files into a single document.
Split PDF
Extract pages or split a PDF into separate files.
Compress PDF
Reduce PDF file size while keeping quality readable.
Merge PDF
3 files → 1 document
Upload
report-q1.pdf · deck.pdf · notes.pdf
Process
Merge pages · Keep bookmarks
Download
merged-report.pdf · 1.2s
Why korisa.app
A privacy-first toolkit for PDFs, images, and developers — finish the task without uploading your files.
Step 1
Open JPG to PDF, PDF Compressor, Image Resizer, JSON Formatter, and dozens more — no installs and no signup.
Step 2
Files stay on your device. korisa.app tools run locally instead of uploading your PDFs, images, or text to a server.
Step 3
Export the result when you’re done. Same calm UI whether you’re converting a PDF, compressing an image, or decoding a JWT.
Categories
Browse focused toolkits — each category opens free browser-based tools for the jobs people search for most.
19 tools
Merge, split, compress, organize, protect, sign, watermark, and convert PDFs privately in your browser.
9 tools
Compress, resize, crop, remove backgrounds, and create YouTube thumbnails.
6 tools
Format JSON, decode JWTs, test regex, and encode Base64 without leaving the tab.
5 tools
Convert currency, units, colors, and number bases with precise controls.
6 tools
Build UTM links, preview meta tags, encode URLs, and generate clean slugs.
7 tools
Compress video, split WhatsApp Status clips, convert audio, and trim tracks.
Popular
The most used utilities — always rendered from the tool registry.
Combine multiple PDF files into a single document.
Extract pages or split a PDF into separate files.
Reduce PDF file size while keeping quality readable.
Convert HTML content into a downloadable PDF.
Export PDF pages as PNG or JPEG images.
Convert PDF pages to JPG images privately in your browser.
Convert PDF pages to PNG images privately in your browser.
Remove password protection from a PDF file.
Rotate PDF pages by 90°, 180°, or 270°.
Reorder, remove, or extract PDF pages.
Guides
Short guides that explain common workflows — and link back to the free tools you can use right away.
How browser-based tools reduce upload risk for PDFs, images, and developer data — and when cloud AI is optional.
Read guideUse utm_source, utm_medium, and utm_campaign consistently — then generate ready-to-share links.
Read guideShrink JPG, PNG, and WebP file sizes for faster pages while keeping images sharp.
Read guidePretty-print, validate, and minify JSON for APIs and configs — privately in your browser.
Read guideFAQ
Quick answers about private browser tools, no-upload processing, and how korisa.app works.
61+ tools across 10 categories — no upload, no signup. Start with search or browse the full catalog.