Tools that keep your files on your device
Every tool here does its work inside your browser, so the file you are converting, merging or cleaning is not uploaded to someone else's server. That matters most for the files people hesitate to upload: contracts, ID scans, payslips, client spreadsheets and private photos.
For PDFs, ApexPDF covers merging, splitting, conversion and OCR, and PDFTeq Merge PDF does one job and invites you to watch your browser's Network tab to confirm nothing leaves. FileOnTap, Image Convert and Quick Image Converter handle HEIC, JPG, PNG and WebP. Photo2Text reads text from images in English, Urdu and Arabic, Free CSV Cleaner tidies a spreadsheet export, and KitBoxDev and FreeToolsBox cover developer and everyday utilities.
The trade-off is speed on big jobs. Your own device does the work, so a large batch on an older phone will be slower than on a laptop.
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Ranked number 1
ApexPDF: free PDF tools that run entirely in your browser
A large free PDF suite, from merging and splitting to conversion and OCR, processed locally with WebAssembly. No uploads, sign-up or watermarks.
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Ranked number 2
PDFTeq Merge PDF: combine PDFs in your browser, no upload
Merge two or more PDFs locally in your browser with pdf-lib: no upload, no sign-up, no watermark, and page quality left untouched.
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Ranked number 3
FileOnTap: convert images and PDFs in your browser, no upload
Free browser tools to convert HEIC, JPG, PNG and WebP, turn images into PDFs, and merge, split or compress PDFs without uploading anything.
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Ranked number 4
Image Convert: free HEIC, JPG, PNG and WebP tools that run locally
Convert HEIC to JPG or PDF, convert, compress, resize, crop and watermark images in your browser, with no uploads or sign-in.
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Ranked number 5
Quick Image Converter: convert HEIC, PNG, JPG and WebP in your browser
Convert, compress and batch-process images between 15+ formats, including HEIC and TIFF, locally in your browser. Free, no sign-up.
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Ranked number 6
Photo2Text: free OCR for English, Urdu and Arabic in your browser
Extract text from photos and screenshots in English, Urdu or Arabic. OCR runs in your browser, so images never leave your device. Free, no account.
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Ranked number 7
Free CSV Cleaner: trim, dedupe and fix dates in your browser
A one-page tool that trims spaces, removes duplicate rows, normalises dates and fixes name casing in a CSV, all locally. Free.
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Ranked number 8
KitBoxDev: 37 free browser tools for developers, DevOps and electronics
JWT debugger, hashes, JSON, cron, CIDR, YAML and Ohm's law calculators in one free site. Everything runs in your browser and nothing is uploaded.
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Ranked number 9
FreeToolsBox: 154 free tools that run in your browser
A free collection of 154 browser tools for text, code, PDFs, images and calculations. Files are processed on your device, no account needed.