Overlay the same page from the same PDF
Input and settings
Page 1 from the same PDF in both A/B slots; 50% overlay.
Expected result
Two 144×72 px renders with the same red background and ALPHA 1; their outlines coincide.
PDF Visual Compare
Render selected pages from two PDFs and compare them with overlays, a slider, or flicker.
How to use
- Choose the two PDFs to compare.
- Choose page numbers and a view such as side by side, slider or overlay.
- Run and inspect differences in page dimensions and rendered contents.
Files and settings
You can also drag and drop files here.
File contents and names are not stored or uploaded.
PDFs: about 41.9 MB and 100 pages per file. Image extraction: 24 MP each, about 100.7 MB total output. Page and image dimension inspection does not decode images.
Result
Share this tool
Share only the tool name and public URL. Your input and results are not included.
Purpose and use
Visually check layout and image changes between selected pages of two PDF revisions.
Example
Compare page 1 of A with page 2 of B when a revision changes the page order.
Interpreting the result
Pages are rendered at 72 PPI. Different page dimensions remain visibly different.
Limits and caveats
This is not a semantic text diff or print color proof. Fonts and transparency depend on PDF.js rendering.
Related workflow
For higher-resolution checks, use PDF to Image followed by Image Compare.
Try a use case and check the result
Choose pages and a display mode to compare their visual appearance.
Example buttons replace the inputs and settings above and calculate. Restore previous input steps back one example at a time. After trying multiple examples, repeat restore to return to your original input. This history is lost when the page closes.
Compare pages with different dimensions and colors
Input and settings
A: blue page 2 at 72×144 pt. B: green page 1 at 144×72 pt. Slider at 25%.
Expected result
A renders at 72×144 px and B at 144×72 px. Aspect ratio and content differ; positions are not automatically registered.
How to read the result
The slider clips B and overlay changes B’s opacity. These are viewing aids, not numerical difference scores. With different page sizes, also inspect margins and positioning.
Scope and limits
Two PDFs, each up to 40 MiB and 100 pages, 80 MiB combined. Selected pages are rendered at scale 1 and may pixelate when enlarged. Font substitution and browser rendering can affect appearance. This does not verify signatures, semantic equality or print quality.
Check identical-page pixels and dimensions, known colors/sizes for different pages, and restoration of A/B order and display settings.
Continue with the next task
Frequently asked questions
Will this change the original file?
No. Downloads are separate files. Closing the page discards the loaded content and results.
At what resolution are pages rendered?
Pages are rendered at 72 PPI. Different page dimensions remain visibly different.
Does it judge semantic text changes or print color accuracy?
It compares rendered appearance, not text semantics or calibrated print colors. Fonts and transparency depend on PDF.js rendering.
Related tools
Inputs and storage
Keep any content you need before clearing. This tool does not autosave inputs or results. Reloading or closing the page, clearing inputs or resetting may discard your work.
Favorites and language preferences are stored separately and may be lost when site data is cleared. Tool resets and site-data deletion do not delete files already downloaded to your device.