CalcBrew

Archives, Ebooks & Fonts

Create ZIP

Send twenty files as one attachment. Drop them here and download a ZIP — created on your device, nothing uploaded.

Runs in your browser — files never leave your device.

Drop image files here

or click to browse · paste from clipboard · up to 100 MB each

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About Create ZIP

Email clients and upload forms take one file at a time, and some block certain extensions. A ZIP bundles everything into one attachment that opens natively on every operating system.

Compression uses Deflate at a level tuned for speed; documents and text shrink substantially, while photos and videos (already compressed) are stored as-is to save time. The result is a standard ZIP that Windows Explorer and macOS Finder open with a double-click.

How it works

  1. Drop your files onto the box above, click it to browse, or paste from the clipboard.
  2. Adjust the options if you need to — the defaults suit most cases.
  3. Press Convert. The work happens on your device, so speed depends on your computer or phone.
  4. Download the ZIP — individually or all at once.

About the formats

JPG · JPEG image · .jpg

The universal photo format: small files, supported by every device, camera and website, but no transparency and slight quality loss on each save.

  • JPEG compression discards fine detail the eye rarely notices; quality 80–90 is usually indistinguishable from the original at a fraction of the size.
  • Re-saving a JPG repeatedly adds generation loss, so keep an original and export copies.
  • JPG has no alpha channel — transparent areas become white or black when converted from PNG.

PNG · Portable Network Graphics · .png

Lossless image format with transparency, ideal for screenshots, logos, icons and graphics with sharp edges or text.

  • PNG is lossless: every pixel is preserved, which is why photos saved as PNG are 5–10× larger than JPG.
  • Supports an 8-bit alpha channel, so edges can be partially transparent.
  • Most browsers and apps have supported PNG since the late 1990s.

PDF · Portable Document Format · .pdf

The fixed-layout document standard: looks the same on every device and printer, which is why forms, invoices, contracts and reports are shared as PDF.

  • A PDF can contain vector text, embedded fonts, images, form fields, annotations and digital signatures.
  • Scanned PDFs are just pictures of pages; they need OCR before the text can be searched or copied.
  • PDF is an open ISO standard (ISO 32000) since 2008.

Word (DOCX) · Microsoft Word document · .docx

The current Word format (since 2007): a ZIP of XML files that Word, Google Docs, LibreOffice and Pages can all open and edit.

  • DOCX layout depends on the fonts installed on the viewing computer, which is why the same file can paginate differently on another machine.
  • Converting to PDF freezes the layout so it looks the same everywhere.
  • DOCX is part of the Office Open XML standard (ISO 29500).

Related conversions

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Frequently asked questions