Online Tools That Never Upload Your Files

Why most online converters need your file

A typical online converter is a program running on someone else's computer. To merge your PDFs or shrink your photo, that program needs the file, so your browser uploads it. The server does the work, stores the result for a while, and sends you a download link.

There is nothing sinister about that design. It is simply how server-side software has to work. But it does mean a copy of your document passes through infrastructure you don't control. HTTPS protects the file on the way there, and then the server decrypts it so it can process it. What happens next depends on that provider's retention policy, logging, and security practices. Many services publish good policies; you are still trusting them.

Why these tools don't

The tools listed below reverse the arrangement. When you open one, the page sends your browser the program — a few hundred kilobytes of JavaScript. When you pick a file, that program reads it straight from your disk into the browser's memory using the standard File API, does the work on your own processor, and gives you the result as a download generated on your device. There is no upload step because there is nothing on our side that could receive the file.

The building blocks are ordinary, well-known browser technology:

• pdf-lib and PDF.js — open-source libraries that read, edit, render and write PDF files in JavaScript.
• The Canvas API — the browser's built-in image surface, used for resizing, cropping, rotating, compressing and converting images.
• The Web Crypto API — the browser's own cryptography, used for checksums, secure random passwords and AES-256-GCM note encryption.
• The File and Blob APIs — how the page reads the file you choose and hands the finished file back to you.

Because nothing is uploaded, there is also no upload wait, no queue, and no server-imposed file-count limit. The trade-off is that your device does the work: very large files are limited by your browser's memory, and tasks that need heavy server-side AI (such as OCR of scanned pages) aren't something these tools attempt.

What we checked — and what we left out

A "no upload" label is only worth anything if it is true, so this list is built from the code rather than from marketing copy. We went through the JavaScript behind every tool on the site and looked for anything that sends data over the network. The tools below make no network request that contains your file or the text you type.

Two parts of the site are deliberately not on this page:

• What's My IP asks a public IP-lookup service which address your connection came from. That is the whole point of the tool, and it cannot be done offline.
• The contact form sends the message you write to us through an email delivery service. That is what a contact form is for.

To be complete: some tools download open-source libraries (such as pdf-lib) from public CDNs when the page loads, and the site uses Google Analytics and Google AdSense, which see page visits the way they do on most free websites. Those requests fetch code or record that a page was viewed. None of the tools pass your files or their contents to them.

Check it yourself in 30 seconds

You don't have to take our word for any of this. Any browser can show you exactly what a page sends:

1. Open one of the tools below, then open your browser's developer tools (F12, or Cmd+Option+I on a Mac).
2. Switch to the Network tab and clear it.
3. Use the tool on a real file and download the result.
4. Look through the requests. You will see no request whose payload is your file. For extra certainty, disconnect from the internet after the page has loaded — many tools keep working.

This is also why the tools are GDPR-friendly by design: your files never leave your device, so we never receive, store, or process their contents. For a longer explanation of the two architectures, read Client-Side vs. Server-Side File Processing.

PDF tools (13)

• Merge PDF — combine several PDFs into one and drag to set the order.
• Split PDF — extract chosen pages or a range, or split every page into its own file.
• Compress PDF — reduce file size at the quality level you choose.
• Rotate PDF — turn pages 90°, 180° or 270° to fix sideways scans.
• Organize PDF — reorder, delete or duplicate pages by dragging thumbnails.
• PDF Editor — add text annotations with your choice of size, colour and position.
• PDF Metadata Editor — view, edit or clear the title, author, subject, keywords and more.
• Add Page Numbers — choose position, format, font and starting number.
• Watermark PDF — stamp text or an image across your pages.
• PDF to JPG — render each page as a JPEG image.
• Image to PDF — turn one or more images into a PDF document.
• PDF to Word — extract a PDF's text into an editable Word document.
• Word to PDF — convert a DOCX file to PDF without installing Office.

Image tools (8)

• Image Compressor — shrink JPG, PNG and WebP images with a quality slider; saves as optimised JPEG.
• Image Resizer — resize to exact pixels or by percentage, with aspect ratio locked.
• Image Cropper — crop to a custom area or a social-media aspect ratio.
• Image Converter — convert between JPG, PNG, WebP, GIF and BMP.
• JPG to PNG — convert JPEG photos to PNG.
• Rotate & Flip Image — rotate by 90° steps or mirror horizontally and vertically.
• Background Remover — make a white or solid-colour background transparent and export a PNG.
• EXIF Viewer & Remover — see camera and GPS metadata in a photo, or strip it before sharing. (The optional map link opens Google Maps only if you click it.)

Text tools (7)

• Word Counter — words, characters, sentences, paragraphs and reading time.
• Word Frequency Counter — find the most used words in a text, with CSV export.
• Text Case Converter — UPPERCASE, lowercase, Title Case, Sentence case and more.
• Text Diff Checker — compare two texts and highlight every difference.
• Text Reverser — reverse by character, word or line.
• Lorem Ipsum Generator — placeholder text by words, sentences or paragraphs.
• Markdown Editor — write Markdown with a live preview and export to HTML.

Data & developer tools (11)

• CSV Editor — open a CSV, edit cells, add or remove rows and columns, and export.
• Data Converter — convert between CSV, JSON and TSV in either direction.
• JSON Formatter — format, validate and minify JSON.
• JSON Table Viewer — turn a JSON array into a sortable, filterable table.
• Base64 Converter — encode and decode Base64 for text and files.
• URL Encoder/Decoder — encode or decode URL components and query strings.
• HTML Formatter — beautify or minify HTML.
• Meta Tag Generator — build SEO, Open Graph and Twitter Card tags.
• Open Graph Preview — preview how a link will look when shared, from the tags you enter.
• UUID Generator — generate v4 UUIDs, one or in bulk.
• QR Code Generator — QR codes for URLs, text, Wi-Fi, email and phone numbers.

Security & device tools (6)

• Password Generator — strong random passwords with your own rules.
• Secure Notes — encrypt and decrypt text with a passphrase using AES-256-GCM.
• Hash Generator — MD5, SHA-1, SHA-256 and SHA-512 hashes of text or files.
• File Checksum — SHA-256, SHA-512 or SHA-1 checksums to verify a download.
• Browser Storage Viewer — inspect and edit this site's localStorage, sessionStorage and cookies.
• Device Inspector — see what your browser reports about your screen, CPU, memory and GPU.

Calculators (6)

• Percentage Calculator — percentages, increases, decreases and change.
• Unit Converter — length, weight and temperature, metric and imperial.
• Timezone Converter — convert a time between zones worldwide.
• Date Difference — days, weeks, months and years between two dates.
• Age Calculator — exact age in years, months and days.
• BMI Calculator — Body Mass Index in metric or imperial units.

When a no-upload tool is the right choice

Client-side tools make the most difference when the file is one you would rather not hand to a third party: contracts and HR paperwork, scans of IDs or bank statements, medical letters, unreleased designs, customer spreadsheets, or photos that carry GPS coordinates. They are also handy on slow connections, where skipping the upload is the fastest part of the job.

A good example is document metadata. A PDF quietly records an author name, the software that made it, and when it was created — and you usually want to clean that up before sending the file out. Our guide to removing or editing PDF metadata walks through it, and the PDF Metadata Editor does the job without your file ever leaving your machine.