RARE FREQUENCYWorks
Practical file guides

A few settings. A lot less guesswork.

Short guides for upload limits, image dimensions, file formats, metadata, and reviewing a finished PDF. Read what you need, then try the tool.

Guide
Image compression without the guessworkUnderstand how image compression, pixel dimensions and file formats affect KB/MB limits and visible quality.
Guide
Resize images without stretching themLearn when to resize, crop or preserve aspect ratio and how common dimensions such as 1080×1080 and 1920×1080 differ.
Guide
JPG, PNG or WebP? Choose by content and destinationCompare JPG, PNG and WebP for photographs, transparency, screenshots, compatibility and web delivery.
Guide
What can be hidden inside an image file?Learn what EXIF and image metadata can contain, what removing it changes, and what to review before sharing a photo.
Guide
Turn a stack of images into a PDF people can actually useLearn how to prepare image scans and photos before combining them into a clean, readable PDF.
Guide
A safer way to edit and finish a PDFA practical checklist for editing, signing, organizing and reviewing PDFs before sharing the finished file.

Why these guides are part of the site

File tools are easy to misuse when the interface is the only explanation. These guides cover the tradeoffs behind the controls so you can decide whether to resize, crop, compress or convert before changing a file. They also explain what a tool cannot do—for example, converting a JPG to PNG cannot restore detail already lost to JPG compression, and removing EXIF metadata does not hide information that is visibly printed in the image.

Each guide links back to the relevant Rare Frequency Works utility. The tools are for doing the work; the guides are for understanding the choice.

Aurevessa tutorials

A clearer path through your documents.

Edit existing PDF text →

Read the practical workflow and review checks.

Recognize text with OCR →

Read the practical workflow and review checks.

Review PDF metadata →

Read the practical workflow and review checks.

Sign your PDF →

Read the practical workflow and review checks.

Organize pages →

Read the practical workflow and review checks.