PDFixel

Compress PDF

Advanced Settings

Apply Settings To

Optimisation Type

Rasterises PDF pages into highly compressed JPEGs. Yields maximum file size savings.

Sizing Goal

Compression strength50%

10%90%

Higher strength = smaller size, but image artifacts may become visible.

Custom DPI Resolution

Manually override page render resolution (Default: Auto DPI)

Convert images to JPEG

Re-encode embedded PNGs to JPEG format

Convert to Grayscale

Remove color channels to shrink file further

Learn & Help

How to Reduce PDF File Size Online Privately

1Upload PDF Document
Select or drag your oversized PDF document into the compression workspace.
2Select Compression Mode
Choose from Balanced, High, or Maximum compression presets, or customize image DPI downsampling.
3Toggle Grayscale & Metadata
Enable grayscale conversion for extra size savings and strip unnecessary metadata objects.
4Inspect & Download
Use the before/after split slider to inspect visual quality and download your compact PDF.

Compression Presets (Low, Medium, High, Max): Quickly choose between gentle compression or maximum size reduction.
DPI Downsampling (72 - 300 DPI): Adjust embedded image resolution for screen viewing (150 DPI) or printing (300 DPI).
Grayscale Conversion: Removes RGB color channels to create super-lightweight black-and-white documents.
Strip Metadata: Removes author tags, creation timestamps, and software metadata.

Smart Image Downsampling
Reduces photographic asset DPI (72-300 DPI) while keeping vector text razor-sharp.
Grayscale Optimization
Converts color streams to 8-bit monochrome for up to 80% extra size reduction.
Before / After Split Inspector
Interactive drag slider lets you verify visual clarity before saving.
Metadata & Object Pruning
Removes orphaned streams, edit histories, and bloated thumbnail caches.
Target Portal Compliance
Easily shrink documents under strict 2MB, 1MB, or 500KB portal limits.
100% In-Browser Privacy
Sensitive bank statements and financial filings never leave your device.

Vector fonts, type outlines, and geometric paths are preserved losslessly. Compression specifically targets oversized embedded raster images by applying intelligent bicubic DPI downsampling and adaptive JPEG/DCT stream re-encoding.

Converting RGB color channels (24-bit) to 8-bit monochrome eliminates two color planes per pixel, yielding an additional 30% to 60% reduction on scanned documents and image-heavy presentations.

Select the High or Maximum compression preset and set DPI downsampling to 150 DPI. The compression summary displays real-time calculated byte sizes before you save.

Yes. Enabling "Strip Metadata" purges orphaned object references, previous undo revisions, and legacy XML metadata packets.

Compress PDF

Shrink large PDFs for email attachments and portal uploads without losing text sharpness.

Drop PDF file(s) here

Supports per-page compression & target size budget

Max 100MB per fileUp to 50 files

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