How to Use
- Choose PDF from your local drive.
- Set parameters:
- Thumb width (px): target width per page (default 240px), aspect ratio preserved.
- Columns: number of columns in the contact sheet (default 5).
- Ranges: e.g.,
1-20/1-3,7,10-12(blank = all pages).
- Generate: click Generate → per-page PNG thumbnails appear with Download links.
- Contact sheet (optional): click Download Sheet to save a single PNG contact sheet of the current grid.
Outputs / Results
- Per-page PNG thumbnails: downloaded as
thumb-p{page}.png. - Contact sheet PNG:
pdf-thumbnails-sheet.png(white background, 10px gaps). - On-screen metadata showing total pages / generated count / width / columns.
[Completely Free] Utility Tools & Work Support Tools
You can use practical tools like CSV formatting, PDF conversion, and ZIP renaming entirely in your browser, all for free. Each tool page clearly explains “How to use it”, “What the output looks like”, and “Important notes & caveats”, so even first-time users can start without confusion.
Notes / Caveats
- Vector/text → raster: pages are rendered to pixels via pdf.js.
- Password-protected PDFs: not supported (no prompt).
- Large PDFs / high effective DPI: may hit browser memory limits—process in page ranges.
- Range syntax: invalid fragments are ignored; use commas for multiple parts and hyphens for ranges.
- CDN dependency: loads
pdf.js 3.11.174from a CDN; blocked/offline environments will fail. - Client-side only: files never leave the browser.
- Contact sheet layout: arranged left→right, top→bottom using the generated thumbs; all thumbs share the same width (heights vary with aspect).
