Ultimate Tools Blog

How to convert an image to Base64 and back. Application in CSS, HTML, email and API.

7 min read - 2026-01-28

How to convert numbers between Arabic and Roman numeral systems using the online converter.

4 min read - 2026-01-28

How to create a barcode online. EAN-13, Code128, UPC formats — which to choose and for what purpose.

7 min read - 2026-01-28

Guide to email address validation: RFC format, common errors, and verification methods.

6 min read - 2026-01-28

How to create an attractive link preview on social media: images, text, common mistakes.

5 min read - 2026-01-28

A guide to using the Flip Text Tool. Reverse lines, words and characters online.

4 min read - 2026-01-28

How to avoid mistakes during mass replacement, using regular expressions and checking the results.

5 min read - 2026-01-28

A Complete Guide to Pressure Units. How to convert between Pa, atm, bar, mmHg. Art. and psi.

6 min read - 2026-01-28

How to divide a network into subnets using a calculator. VLSM principles, supernetting, and route aggregation.

8 min read - 2026-01-28

How to take notes so you never forget anything. Note-taking methods, information structuring, and organizing records.

7 min read - 2026-01-28

Practical contrast recommendations for web designers and developers.

5 min read - 2026-01-27

A complete guide to color formats: HEX, RGB, HSL, CMYK. How to select and convert colors.

6 min read - 2026-01-27