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.

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Funciona offline
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convert / Comprimir

Comprimir

Reduzir tamanho re-amostrando imagens.

Adicione pelo menos um PDF na bandeja para começar.

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Metodologia e Transparência Técnica

Bibliotecas utilizadas

pdf-lib — Lógica principal de construção e edição de PDF
pdf.js — Renderização de PDF e rasterização de páginas

Estratégia de memória

Após cada operação, URL.revokeObjectURL() é chamado imediatamente. Todos os handles de documentos pdf.js são destruídos via pdfDoc.destroy(). Os workers são encerrados na conclusão ou desmontagem do componente.

Não garantimos o armazenamento permanente de arquivos (pois não os armazenamos). O processamento local de PDFs protegidos por senha não é suportado.

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.