Knowledge base

Guides: make any file fit

Real upload limits, honest numbers and step-by-step fixes - written by the team that builds the tools. Every guide links straight to a free tool that solves the problem in your browser.

Email & Messaging

Email & MessagingEmail attachment size limits, explainedCurrent attachment limits for Gmail, Outlook, iCloud, Yahoo and company mail servers - plus why a 24 MB file still bounces and how to shrink it.3 min read

Images & Photos

Images & PhotosJPG, PNG, WebP or HEIC - which format when?A practical comparison of JPG, PNG, WebP, HEIC, AVIF, GIF and SVG - which format is smallest for photos, which keeps transparency, and what uploads accept.3 min read Images & PhotosDPI, print sizes and passport photos - the actual mathWhat DPI really means, why 300 DPI is the print standard, and the exact pixel sizes for 35x45 mm and 2x2 inch passport photos.3 min read

PDF & Documents

PDF & DocumentsWhy your PDF is huge - and how to shrink itWhat actually makes PDFs huge - scans, images, fonts - and how to shrink a PDF to 1 MB or less without wrecking readability or signatures.3 min read

Applications & Forms

Applications & FormsSurviving application portal upload limitsWhy portals demand a 100 KB photo or 20 KB signature, how to hit those targets without visible quality loss, and how to prepare a full application under 2 MB.3 min read

Video & Audio

Video & AudioWhat actually decides video file sizeVideo size is bitrate times duration - not megapixels. What bitrate, resolution and codec really do, plus realistic settings to hit any MB target.3 min read Video & AudioSending large videos without the quality massacreSize limits for sending video via WhatsApp, Telegram, Discord, Signal, iMessage and email - what each platform does to your clip and how to keep quality.3 min read

Office Files

Office FilesShrinking Word, Excel and PowerPoint filesDOCX, XLSX and PPTX are ZIP packages - embedded images and media make them explode. Where the megabytes hide and how to compress Office files safely.3 min read

Archives & ZIP

Archives & ZIPZIP, TAR.GZ or GZIP - and when compression actually helpsWhat ZIP, TAR, TAR.GZ and GZIP actually do differently, why zipping photos saves almost nothing, and which archive format to pick for each recipient.3 min read

Privacy

PrivacyYour photos talk: EXIF metadata and how to silence itPhotos carry GPS coordinates, timestamps and device details in EXIF metadata. What exactly is stored, which platforms strip it, and how to remove it yourself.3 min read