What is a linearized PDF?

A linearized PDF places first-page data and navigation hints near the start so a compatible viewer can request useful byte ranges before the complete file arrives.

Will this make every PDF smaller?

No. Linearization adds hint data and can increase size. Lossless stream optimization may offset that overhead, but the tool reports the measured result honestly.

Does Fast Web View work on every host?

No. The server or CDN must support HTTP byte-range requests, and the PDF viewer must use them. Some caches and viewers still fetch the complete file.

Are text, links and forms preserved?

Yes. QPDF reorganizes PDF structure without rasterizing pages. Existing JPEG pixels are not recompressed.

How is the output verified?

The tool checks the linearization dictionary, declared length, hint tables, QPDF structure and PDF.js page count before enabling download.

Are digital signatures preserved?

No. Any byte-level rewrite invalidates existing digital signatures.

Can it optimize a protected PDF?

Yes, with the correct password and authorization. The protected source is unlocked locally and the output is not re-encrypted.

No. QPDF WebAssembly, previews, verification and download preparation run in the current browser tab.

PDF Tools

Optimize PDF for Web

Linearize a PDF with verified Fast Web View hint tables for progressive byte-range delivery.

Free browser toolRuns in your browserNo sign-up

Fast Web View workspace

Linearize a PDF for progressive web delivery

Reorder PDF objects and build verified hint tables so a compatible server and viewer can request the first page before the complete file finishes downloading.

—

source pages

—

Fast Web View

—

output size

Drop a PDF here or browseProtected PDFs prompt for the known password locally. One PDF at a time.

What web optimization changes

QPDF moves first-page objects near the beginning, writes linearization hint tables, compacts object streams and recompresses compatible Flate streams. It does not rasterize pages or recompress JPEG pixels.

Private workspace. Files stay in this browser tab and are never uploaded to ToolsOnDuty.

Nothing downloads automatically. Web optimization may increase file size.

About the Optimize PDF for Web

Optimize PDF for Web uses QPDF linearization to move first-page objects near the start of the file and create hint tables that compatible PDF viewers can use with HTTP byte-range requests.

The rewrite also regenerates compact object streams and recompresses compatible Flate data at maximum compression. It does not rasterize pages or recompress existing JPEG pixels, so selectable text, vectors, links, forms and page dimensions remain available.

Success is shown only after the linearization dictionary, declared file length, hint tables, QPDF structure and PDF.js page count all pass verification. The result also reports the byte range ending after the first-page section.

Linearization is a delivery optimization, not a guaranteed size reduction. Progressive display still depends on server Range support, PDF viewer behavior and CDN or cache configuration. Rewriting invalidates existing digital signatures.

Key features

QPDF Fast Web View linearization
Verified linearization dictionary and declared byte length
Fresh hint-table and structural checks
PDF.js page-count and first-page preview verification
Lossless object-stream and Flate recompression
Selectable text, vector, link and form preservation
First-page byte-range measurement
Already-linearized source detection
Authorized protected-PDF input support
Honest before/after size reporting
Custom filename and explicit download
Private local WebAssembly processing

How to use

1Choose the PDF that will be delivered from a website, CDN or document portal.
2If it is protected, provide the known password and confirm authorization in the local unlock dialog.
3Select Optimize for Fast Web View and wait while QPDF reorders objects and creates hint tables.
4Review the linearization, structure, page-count and preview verification results.
5Compare file size and the reported first-page byte section without assuming linearization will make the file smaller.
6Download the result, deploy it to hosting with HTTP byte-range support and test progressive behavior through the real delivery path.

Examples

Publish a large product catalog

Input: Multi-page vector catalog served from a CDN

Output: Linearized PDF with verified first-page hints

Confirm the CDN keeps Range requests enabled and does not force full-file delivery.

Refresh an existing Fast Web View file

Input: Already-linearized PDF with old hint tables

Output: Rewritten linearized copy with fresh verified hints

The output may be slightly larger because delivery layout is prioritized over minimum size.

Frequently asked questions

What is a linearized PDF?: A linearized PDF places first-page data and navigation hints near the start so a compatible viewer can request useful byte ranges before the complete file arrives.
Will this make every PDF smaller?: No. Linearization adds hint data and can increase size. Lossless stream optimization may offset that overhead, but the tool reports the measured result honestly.
Does Fast Web View work on every host?: No. The server or CDN must support HTTP byte-range requests, and the PDF viewer must use them. Some caches and viewers still fetch the complete file.
Are text, links and forms preserved?: Yes. QPDF reorganizes PDF structure without rasterizing pages. Existing JPEG pixels are not recompressed.
How is the output verified?: The tool checks the linearization dictionary, declared length, hint tables, QPDF structure and PDF.js page count before enabling download.
Are digital signatures preserved?: No. Any byte-level rewrite invalidates existing digital signatures.
Can it optimize a protected PDF?: Yes, with the correct password and authorization. The protected source is unlocked locally and the output is not re-encrypted.
Is the PDF uploaded?: No. QPDF WebAssembly, previews, verification and download preparation run in the current browser tab.

Open a related tool to prepare your files or refine the finished result.