Private by design

Every tool. Every day.
Your files stay yours.

Merge, compress, convert, sign — 80+ PDF and everyday tools. Free, no signup, and private by default.

Start freeSee how it works
No file uploads No ads No signup
Try it — right here On your device

Drop a PDF to compress it

It runs in this tab — your file never uploads.

Choose a PDF

Open your Network tab — you’ll see zero uploads.

All tools

Pick a tool — most run right in your browser, nothing uploaded.

Data & spreadsheets· 7

See all 7 →

CSV cleaner

Fixes delimiters, blank rows and broken quoting.

Runs in your browser

CSV to JSON

Typed JSON, with the header row as the keys.

Runs in your browser

CSV to Excelsoon

A real .xlsx, with columns sized to fit.

Runs in your browser

Excel to CSVsoon

One sheet or every sheet, in the encoding you need.

Runs in your browser

JSON to Excelsoon

Nested objects flattened to one row per record.

Runs in your browser

XML to Excelsoon

Elements and attributes mapped onto rows.

Runs in your browser

Text tools· 5

Text diff

Line and word changes highlighted side by side.

Runs in your browser

Case converter

camelCase, snake_case, Title Case and six more.

Runs in your browser

Slugify

URL-safe text, with accents and symbols handled.

Runs in your browser

Sort lines

Alphabetical, numeric or reversed. Duplicates removed.

Runs in your browser

Lorem ipsum

Placeholder words, sentences or paragraphs.

Runs in your browser

Workspace· 8

See all 8 →

Smart notes

Quick notes that sync across your devices.

Synced to your account

Habit tracker

Daily streaks you can see at a glance.

Synced to your account

Budget tracker

Where the money went, by category and by month.

Synced to your account

Receipt scannersoon

Reads the total, date and merchant off a photo.

Processed on our servers

Workflowssoon

Chain several tools and run them all on one drop.

Runs in your browser

Client packet buildersoon

Assemble a branded pack of documents, in order.

Runs in your browser

Browse all 114 tools →

What happens to your file, tool by tool

Runs in your browser
Your file never leaves your device and is never uploaded.
Processed on our servers
Sent to our server over an encrypted connection, converted, then deleted immediately.
AI-powered
Uses AI, and only when you ask it to.
End-to-end encrypted
Encrypted on your device before it is stored — only you can unlock it.
Synced to your account
Saved to your DiemDesk account so it follows you between devices.

The same, every time

Three steps. 80 tools. No surprises.

Open a tool, drop your file, take the result. There’s no account to make, no queue to wait in, and no upload — the work happens inside your browser, so the document never leaves your device. Merging a contract behaves exactly like compressing a scan or turning a photo into a PDF.

  1. 1Pick the tool you need
  2. 2Drop the file — it stays on your device
  3. 3Download the result, or send it straight to the next tool

Shown here: a real tool page, cycling through three of the 80.

diemdesk.com/compress-pdf

Compress a PDF

report.pdf · 4.8 MB

4.8 MB820 KB
Compressed · 820 KB
Put to the test

The scans other tools give up on

We tested a 27 MB scanned book that big-name tools returned almost unchanged — DiemDesk cut it by 75%, without the file ever leaving the browser.

Try Compress PDF

27.1 MB6.8 MB

75% saved

Verify in your Network tab

How it works

Three steps — and your files never leave your device.

Step 1

Pick a tool

Choose from 80+ tools and drop your file in — no account, no upload to a server.

Step 2

It runs in your browser

Your own device does the work. The file is opened locally and never sent to us.

Step 3

Download the result

Save it straight back to your device. Close the tab and nothing is left anywhere else.

See exactly where your data goes →

Your toolkit80 free tools

All-in-one toolkit

One workspace. Every tool, every day.

PDFs, QR codes, passwords and more — a whole toolkit that runs free, right in your browser. One tab, everything you reach for.

Browse all tools
document.pdf
DOCJPG

PDF workspace

Everything for your PDFs.

Merge, split, compress, convert, sign and more — a complete PDF workspace, private by design. Replace your $20/mo PDF subscription.

Open PDF tools
compress⌘K

Compress a PDF

PDF workspace

↵

Generate a QR code

QR generator

Keyboard-first

Find any tool in a keystroke.

Press ⌘K anywhere to search and launch any tool instantly. One workspace, zero hunting through menus.

Explore all tools

The DiemDesk Editor

Your PDF, your canvas.

Annotate, sign, redact and edit with the precision of a design tool and the ease of a doc — ⌘K commands, snap-to guides, a live properties inspector and reusable signatures. Nothing uploaded, ever.

The DiemDesk Editor — highlighting and signing a PDF, entirely on your device
Open the DiemDesk Editor

Why DiemDesk

Built private, fast, and free — without the catch.

Files never leave your browser

Core tools run 100% on your device — nothing is uploaded to any server.

Free, no signup

Use the core tools free — no account, no watermark, no catch.

Every device

A premium experience on desktop and mobile. Native apps on the way.

No daily limits

Use every in-browser tool as often as you like — no 2-tasks-a-day caps like other sites. (Office conversions: 3 free a day.)

80

Tools and growing

0

Ads or trackers

0

Files uploaded

for in-browser tools

$0

To get started

DiemDesk vs typical PDF sites

Typical PDF site
DiemDesk
Daily limits
~2 tasks/day
Unlimited
Sign-up required
Usually
Never
Files sent to their servers
Yes
No — in your browser
Beyond PDF (image, video, QR)
PDF only
All included
Cost to lift the limits
$4–20 / month
Free — nothing to lift

See the full comparison →

Both are free to start — but a typical free plan caps everyday use, and lifting those caps is what costs $4–20/mo. Ours has no such cap. An optional Pro plan (planned ~$5.98/mo) later adds power features like batch and OCR, not everyday limits.

Simple pricing

Start free. Upgrade when you need more.

Free

$0/forever

  • Every everyday tool — PDF, image, video & utilities
  • Unlimited on-device tools — no daily limits
  • Big files free — up to 100 MB in your browser
  • Full-strength compression — Strong & Maximum
  • Sign PDFs now — annotate & basic redaction coming soon
  • 3 free Office conversions a day (PDF ↔ Word/Excel/PPT)
Get started free
Most popular

Pro

$5.98/mo

or $60 billed yearly

  • Everything in Free — with more scale
  • Unlimited file size (free already handles up to 100 MB)
  • Batch processing — many files at once
  • Edit PDF text + Search & pattern redaction
  • Unlimited Office conversions + OCR — no daily cap, any size
  • AI document suite — chat, cited summaries, translate, question generator, AI find-personal-info, table clean-up (launching with Pro)
Go Pro

See full pricing & feature comparison →

Common questions

Is it really free?

Yes — the in-browser tools are free forever, with no signup, no watermarks and no daily limits, on files up to 100 MB. The few tools that run on our servers (Office conversions) give you 3 free a day; unlimited is a Pro feature. Because the in-browser tools cost us nothing to run, they stay free — we only meter what actually uses our servers.

Are my files private?

The core tools run entirely in your browser, so your files are never uploaded. A few tools (OCR, Office conversions) use our servers and are processed then deleted — and we say which, up front.

Do I need an account?

No. Use any tool without signing up. An account only matters later, for Pro.

Which browsers work?

Any modern browser — Chrome, Edge, Firefox or Safari — on desktop or mobile.

Is it safe for sensitive documents?

Yes. Because in-browser tools never send your file anywhere, you can check for yourself: open your browser’s Network tab while you use a tool and you’ll see zero uploads.

Ready when you are.

Start with 80+ private tools — free, no signup, and nothing ever leaves your device.

Start free — no signupBrowse all tools