Make PDFs easier to read on your e-reader. Auto crop, chapter navigation, grayscale or black-and-white scans, reflow and compression.
Make papers, textbooks, professional documents and presentation PDFs easier to read on e-readers.
Wide margins, tiny text, missing navigation or gray scan backgrounds? PDF Tuner helps you prepare a more comfortable reading copy on your Mac.
Add a PDF → Choose an optimization → Check the preview → Start
Built-in presets keep setup simple. Feature search helps you find the setting you need.
FIVE TOOLS FOR BETTER READING
• Auto Crop
Automatically chooses text or pixel detection for each page, finds the content area and removes excess margins to make better use of small screens.
• Table of Contents & Outline Navigation
Detects headings in text-based PDFs and creates clickable outline bookmarks with up to three levels. Multilingual heading detection reduces interference from headers, footers and page numbers.
• Grayscale & Scanned Black-and-White
Grayscale preserves existing searchable text and tonal detail. Scanned black-and-white processing reduces gray backgrounds, with adjustable contrast, stroke preservation and resolution. Optional photo detection keeps grayscale in detected photo areas. A new 150 DPI option lets you trade fine detail for smaller black-and-white output.
• Text Reflow
Turn supported text PDFs into a single-column layout with Standard, Large or Extra large text to reduce horizontal panning. A text-only option leaves out images.
• Flexible Compression
Choose Clarity First, Balanced or Size First, or keep images at their original resolution. Optimize images and fonts and optionally remove attachments and other non-reading data to balance clarity and file size.
PREVIEW, PROCESS & EXPORT
Check layouts with 30+ e-reader screen profiles. Compare original and optimized crop or image-processing previews, then inspect the generated file. Process multiple PDFs, export results, reveal them in Finder or open them in another app.
Optional watermark cleanup is also available. If Send to Kindle is installed, use “Send to…” to hand off your PDF for delivery.
LOCAL PROCESSING. CORE FEATURES FREE.
All analysis, previews and optimization run locally on your Mac. Documents are never uploaded to a server. Results are saved as separate reading copies, keeping your originals intact.
Core optimization features remain free to use. An optional one-time Pro upgrade removes upgrade prompts and supports continued development.
TERMS OF USE (EULA)
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
This app hasn’t received enough ratings or reviews to display an overview.
Is it processing?
Michael D. Mullins
I click the button to process the PDF and nothing happens. I get the feeling that it’s working in the background, but there’s no feedback that lets you know that it’s processing. This is software 101. You have to get this right before your app becomes truly viable.
Developer Response
Thanks for your feedback, and sorry to have let you confused. I guess this must have something to do with PDF file access control. In early version(1.0.5) when adding a protected PDF there was a red lock icon indicating this PDF cannot be tuned. But it might be not noticeable and Start Tune button was not be disabled completely(my bad). In the latest version I have improved this. Please have a try to see if it works for you.
This update makes PDF optimization easier and reading more comfortable:
- Find features faster: search by keyword and jump directly to the highlighted setting.
- New Auto Crop mode: automatically selects a margin detection method for each page, making it easier to handle PDFs that mix text and scanned pages.
- Adjustable reflow text size: choose Standard, Large, or Extra Large, with improved text sizing on high-resolution reading devices.
- New 150 DPI option for black-and-white processing: prioritize smaller files and faster processing.
- Added Traditional Chinese interface.
Version 2.4.1
The developer, 军 黄, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
The developer indicated that this app supports the following accessibility features. Learn More
Supported Features
Dark Interface
Differentiate Without Color Alone
Information
Seller
军 黄
Size
77 MB
Category
Productivity
Compatibility
Requires macOS 10.15 or later.
Mac Requires macOS 10.15 or later.
Languages
English and 5 more
English, French, German, Japanese, Simplified Chinese, Traditional Chinese