Smallpdf alternative without uploading files
Compare local PDF compression with Smallpdf Basic using the same 20 MB scan: measured output sizes, page checks, upload handling and practical limits.
Checked · OpenToolSuite editorial test
Feature comparison
| Feature | OpenToolSuite | Smallpdf online tools |
|---|---|---|
| Processing location | PDF compression runs in this browser. No processing upload to OpenToolSuite. | The online compressor processes uploaded files in the cloud. |
| Compression choices | Compact copy, or optional flattening with three presets and adjustable JPEG quality. | Basic; Moderate and Strong are described as Pro options. |
| Result feedback | Shows original size, output size and the actual change, including when no reduction is achieved. | The tested result screen showed size and percentage reduction. |
| Account for this test | No account or paid plan was used. | Basic completed without starting a trial. |
| File limits on the local tool | Up to 20 selected PDFs, each below 100 MB; memory and document complexity still matter. | Current usage limits and paid options should be checked on the provider page. |
| Retention | No uploaded processing copy is created by this local compressor. | The cited compressor page states automatic file deletion after one hour. |
| Interactive content | Compact mode retains compatible PDF objects; flatten mode makes image-only pages. | Inspect the actual output for forms, links and text; our scan had none to test. |
Provider features come from the linked official page; tested observations and unavailable measurements are labeled separately.
Measured test: the same 20 MB scanned PDF
Exact byte sizes below come from the downloaded files. Reduction is (input bytes − output bytes) ÷ input bytes. The input is intentionally uncompressed, so these large reductions are not a promise for your PDF.
| Tool and setting | Output size | Reduction | Verification |
|---|---|---|---|
| OpenToolSuite · Standard flatten · 72% JPEG | 266,697 bytes (260.45 KiB) | 98.67% | 4 pages; all pages rendered; check line readable |
| Smallpdf · Basic | 345,951 bytes (337.84 KiB) | 98.27% | 4 pages; all pages rendered; check line readable |
Input SHA-256: 7799703e58b2fbe0d8e6c454b2c7423d0a1ffb65d627ab481012681319269aad
Reproduce the input with the linked generator and PyMuPDF 1.26.6. Identical input bytes were used; the local test filename was renamed to distinguish downloads.
How we ran the test
On 29 September 2026 we used one four-page, image-only A4 PDF in desktop Chrome. Its exact input size was 20,001,319 bytes (20.00 decimal MB). The pages contain fictional report rows and an 8-point check line, not customer documents. The input embeds uncompressed RGB images deliberately; an already-optimized PDF is likely to behave very differently.
OpenToolSuite was tested first in compact mode, then with Flatten pages for size enabled, the Standard preset and JPEG quality 72%. Smallpdf was tested with its Basic option without starting a paid trial. We opened the downloaded outputs, counted all pages, rendered every page and inspected the row labels and the small-print amount 11,800.00. This was a single run per selected mode, not a speed, accessibility or broad quality benchmark.
What the result does and does not show
The OpenToolSuite flattened output was smaller on this particular scan fixture. Both inspected outputs kept four pages, and the check line remained readable; the OpenToolSuite small print looked softer at an enlarged view. Neither output gained selectable text, because the original was already an image-only scan. A smaller file alone does not establish better document quality.
Compact mode displayed 19.1 MB before and after in the OpenToolSuite interface, rounded to one decimal place. Re-saving PDF objects is not the same as recompressing their images. Flattening is an explicit tradeoff: it rebuilds page images and can remove selectable text, form fields and interactive links from documents that originally contain them. Keep the original if those features matter.
Choose the workflow for the document
Use the local route when you need to avoid a processing upload and can work within the browser’s memory. Start with compact mode for a text document, inspect the result, and choose flattening only when a page-image copy is acceptable. Use an online workflow when its supported features and observed output better suit your task and uploading that document is appropriate.
This comparison covers the two named compression settings only. It does not test every Smallpdf product, paid setting, signed PDF, scanned-language OCR workflow or mobile device. For an actual submission, check the recipient’s byte limit and open the final file at normal reading zoom before sending it.
Which workflow fits?
Both tools produced a smaller, readable four-page copy of this scan. OpenToolSuite produced the smaller tested file, with visibly softer small print. Choose using document privacy, required PDF behavior and your own output inspection rather than a single compression percentage.
Product features can change. This comparison is published by OpenToolSuite, one of the products being compared. It is not an independent laboratory certification or an endorsement by the other provider.