What is the difference between compression levels?

Low re-packs the file structure without quality loss. Medium and High rasterize pages to JPEG at progressively lower quality — smaller file, less crisp.

Will text stay selectable after compression?

Only with the Low level. Medium and High rasterize pages, converting text to pixels.

Is there a file size limit?

No server limit — your browser's available memory is the only constraint. Very large PDFs may take a minute on Medium or High.

Sin subida
CPU local
Funciona sin conexión
Limpieza automática

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convert / Comprimir

Comprimir

Reducir tamaño remuestreando imágenes.

Añade al menos un PDF en la bandeja para empezar.

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Metodología y Transparencia Técnica

Bibliotecas utilizadas

pdf-lib — Lógica principal de construcción y edición de PDF
pdf.js — Renderizado de PDF y rasterización de páginas

Estrategia de memoria

Tras cada operación, se llama a URL.revokeObjectURL() inmediatamente. Todos los handles de documentos pdf.js se destruyen mediante pdfDoc.destroy(). Los workers se terminan al completar el procesamiento o al desmontar el componente.

No garantizamos el almacenamiento permanente de archivos (ya que no los almacenamos). El procesamiento local de PDFs protegidos con contraseña no está soportado.

Key Features

Three compression levels
Low (lossless re-save), Medium (1.5× JPEG rasterization), and High (1× JPEG) — choose the right trade-off.
Size reduction stats
After compression, the tool shows original size, compressed size, and percentage saved.
Lossless option available
The Low level uses object-stream packing — text stays fully selectable and vector graphics are not degraded.

Common Use Cases

Valuable for shrinking PDFs before emailing (most services cap at 10–25 MB), uploading to document portals with size restrictions, or reducing storage footprint for archival.

Frequently Asked Questions

What is the difference between compression levels?: Low re-packs the file structure without quality loss. Medium and High rasterize pages to JPEG at progressively lower quality — smaller file, less crisp.
Will text stay selectable after compression?: Only with the Low level. Medium and High rasterize pages, converting text to pixels.
Is there a file size limit?: No server limit — your browser's available memory is the only constraint. Very large PDFs may take a minute on Medium or High.