A PDF reader for Mac & Windows.

Read the PDF.
Keep the thought.

Highlight what matters. Keep notes beside the page.
Fill, sign or ask AI for a hand when there’s more to do.

Get Readlet Try it in your browser

Free to read, annotate and take notes. No account needed.

Readlet on Mac displaying a satellite photograph of the Cocos Islands, with page thumbnails and a ChatGPT-connected agent comparing island formations across the book
Read without distractions Keep your thoughts close Ask AI for a hand
Features

A good read.
Down to the last detail.

Ambient Mode

Let the page set the background colour. Ambient Mode picks up tones from your document as you read.

Focus Mode

Put the tools away while you read. Bring them back when you need to make a note or mark a passage.

1 / 5

Smart Search

Search text and scanned pages. Results take you to the passage, and built-in OCR runs on your device.

invoice total
p.3 ...the invoice total is $2,450...
p.7 ...previous invoice total amount...

Local by default

Reading, search, editing, forms, and signatures stay on your device. AI is optional and only runs when you ask.

Light & Dark

A clear light theme for the day. A comfortable dark theme when the room gets dim.

Notes, beside your PDF

Your notes.
Right beside the page.

Keep one note for the whole document. Type @ to connect a thought to a page, or write a general note without a link.

Notes in Readlet. A preview, a page link, or just your words.

A link when you need one.

Connect a page, include a preview or write freely. You don’t have to organise every thought before getting it down.

Help with your words.

Ask Readlet AI to rewrite a passage in place. Review what changed and undo it. You can work on notes from the AI sidebar, too.

Writing assistance is part of Plus
Readlet AI · Plus

Use the tools.
Or ask Readlet to.

Ask a question and follow the answer back to the page. Or ask Readlet to highlight passages, fill a form, organise pages or rewrite part of your notes.

Changes come with a record of what happened and a way to undo.

Explore Readlet Plus
Marking up
Highlight, underline or strike through the passages you name.
Filling a form
Complete fields from your saved details, add text boxes, place your signature.
Organising pages
Rotate, reorder, duplicate, delete, or insert a blank page.
Working on notes
Rewrite a passage in place, build on an idea or turn your notes into a summary.
Making sense of it
Answer from the document, citing the page. Translate what’s in front of you.

You can keep working with the tools yourself. AI is there when you choose to use it.

With your existing account

Use your ChatGPT account.

Connect the ChatGPT account you already use. Ask about your documents without a separate API key.

Built into the Mac and Windows apps. Chrome needs a one-time Companion install. Your plan’s availability and usage limits apply.

On your own device

Keep AI on your computer.

Use a local AI model on Mac or Windows. Once the model is downloaded and set up, you can ask about your PDFs offline, with document context staying on your computer.

Model choices and available features depend on your hardware and local AI setup.

Readlet AI is part of Readlet Plus. Your ChatGPT plan is separate.

Edit and sign

Finish the document.

Type, draw, fill forms, and place a saved signature without leaving the reader. Adjust your edits before exporting the finished PDF.

  • Resizable text fields, including automatically detected ones
  • Ink tuned for mouse, trackpad, pen, and touch
  • Hide your edits while reading, then show them again
  • Basic annotations, forms and typed or drawn signatures are free
Document translation · Plus

Read another language.
Keep your place.

Translate the pages you need and read them in place. Keep a translated PDF when you are done, or return to the original at any time.

  • Move between the original and translated view
  • Keep a translated copy for reading and printing
  • You choose when to use AI and which provider to use
Actual Readlet interface, with a prewritten sample translation.

Room for more than one PDF.

Keep documents in tabs, move between them, and pick up where you left off. On Mac and Windows, pull a tab into its own window.

The pages you need. In order.

Combine PDFs, rearrange pages, rotate a scan, or extract just the useful part. Export a page as an image, too.

Some things should stay private.

Mark sensitive areas for permanent redaction. Export a fresh, image-only PDF with that content removed, and keep your original separately.

Continue reading Recent files reopen on the page you left.
AI on your computer Use a supported local model offline on Mac or Windows.
Keep control of your edits Adjust annotations and undo changes as you work.
Your information vault Reuse form answers and saved signatures locally.

Your documents. Your choice.

Reading, OCR and everyday editing happen on your device. Cloud AI sends the selected document context to the provider you choose. You can leave AI off, including for individual PDFs.

AI setup and available models vary by platform. Chrome’s ChatGPT connection uses Companion; the Mac and Windows apps have it built in.

How privacy works
The little things

The little things you use every day.

Smooth at any scale

Trackpad, mouse, touch, and pen gestures stay anchored to the content beneath you, even through fast zooming and long pages.

Page-by-page control

Rotate, duplicate, remove, reorder, or export an individual page without disturbing the original document.

Search without waiting

Results appear progressively, group themselves by page, and stay keyboard-navigable while local OCR handles scanned text.

Comfortable in every theme

Choose light or dark, then let Ambient Mode borrow subtle colour from the page when you want the document to set the atmosphere.

A little more from Readlet

Free to read.
More when you need it.

Reading, notes, highlights, ordinary forms and page tools are free. Plus adds AI, help with your writing, adding text to PDFs, translation and advanced signature capture.

Explore it in Readlet
Readlet+

US$9.99 once

Pay once. Keep Readlet Plus.
No subscription.

Try it for 60 days, without a card.
You choose when to start the trial inside Readlet.

Your documents, notes and edits stay yours when the trial ends.

Make yourself at home

A place for your PDFs.
On your desktop.

Download for your computer and open your first PDF.

Beta

Readlet for Mac

Apple silicon · macOS 14 or later

A dedicated Mac app, with native document tabs and windows.

Checking Mac download…

Looking up the latest Mac release.

Beta

Readlet for Windows

Windows 10 or later · x64

A focused Windows app with document tabs and the tools close at hand.

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Looking up the latest Windows release.

The desktop apps are in beta. Some features are still being refined, and availability varies by platform.

Checking the latest desktop releases…

All releases

Open in your browser Add to Chrome Tablet editions are not available yet.
How will updates work?

The desktop apps include an updater. Readlet checks for new versions and downloads signed updates. Windows waits until your document tabs are closed before installing on quit; Mac uses its built-in update flow. You can also check manually. Older Mac builds without the updater need a one-time reinstall.

Can I use Readlet offline?

Yes. Reading, notes, search, local OCR, annotations and ordinary document work do not need a server. Windows may download Microsoft WebView2 during first installation. Cloud AI, downloads and update checks need a connection.

Is everything available on every platform?

The core reader is shared. Native window behaviour and local-model options vary by platform, and tablet releases are not available yet. The Mac download targets Apple silicon.