20 Websites Worth KnowingSafe · Legal · Useful

Search archived versions of websites and explore the history of webpages preserved by the Internet Archive.

Read and download books whose copyrights have expired in the United States.

Search a digital library catalog and borrow available digital books.

Access openly licensed textbooks and educational resources.

Study mathematics, science, computing, economics and other essential subjects.

Explore online courses, certificates and learning programs from participating institutions and organizations.

Calculate answers, analyze data and explore computational knowledge.

Edit raster and vector images directly in a web browser.

Compress and convert images while comparing output quality.

Remove image backgrounds using an automated online tool.

Remove or replace backgrounds from supported video clips.

Turn screenshots into polished presentation and product mockups.

Present designs inside device, print and product mockups.

Create graphics, presentations, social content and other visual materials.

Discover software alternatives based on platform, license and user recommendations.

Convert source-code snippets into clean, shareable graphics.

Create attractive images from source-code snippets.

Check whether an email address appears in known public data-breach records.

Analyze files, domains and URLs using multiple security engines. Do not upload confidential, proprietary or personally identifiable information.

Inspect how a website loads and review technical indicators. Public submissions may be visible to others, so never submit confidential URLs or sensitive information.