!!!!UPDATED 7/1/25!!!!!

Backgrounds

here

here

here

here

here

here

Pixels

here

here

here

here

here

here

Fonts

here

here

here

here

here

here

Base Codes

here

here

here

here

Image Editors

Waifu2x

OIE

Pixlr (Multiple)

Code Hosting Sites

Pastebin

Paste.ee

Cryptbin

p.ip.fi

Hastebin

Zerobin

Update Tabs

Aligning Your Layout

Cheat Sheet

Infinite Scrolling

Tooltips + Troubleshooting

How to Add Favicons

Compress Your Theme Code (helps prevent tampering and stealing)

Make Your Theme Accessible To Disabled People

How To Make Your Sidebar Image Change On Refresh

Pixel Text Bubble Maker

Add Falling Snowflakes (to view the demo change “.org” to “.tumblr.com”)

Custom Scrollbar

How To Use Image Mapping and an Image Mapping Website

Multi-Column Theme Tutorials (Masonry,Wookmark,Isotope,& Freetile)

Icon Generator (as far as i can tell this site is dead, but this is a snapshot of how it looked. if anyone knows of a working version please let me know as i’d like to find it again)

HTML Color Picker + Pick Colors From An Image

A Ton of Free HTML Effects (more here)

Text to ASCII Art Generator

I was going to sandwich this into my other masterpost but it’s too specific so here we go!

Epilepsy

freezeframe.js - turns off animated gifs and give multiple options like play on hover or start/stop when clicked

Dyslexia

this font - free + open source

font masterpost here - the longest and most helpful I’ve found

Colorblindness

How to make posts grayscale - ignore the first part for color on hover

this explanation - talks about colorblindness and how it can effect website design, a good reference overall

Display Energy Levels

HP bar + tutorial - variation here

the original spoon meter

an old spoon meter post and it’s updated version

spoon meter that has easily customizable images - great if you want to change out your meter style frequently

battery code - variations here, here (dead link at the bottom of the last post is saved here)

battery code that doesn’t use images or javascript

another cute battery code with faces based off of Scribblenauts

Misc

remove capital letters or have every sentence be capitalized + more

Disable autoplay - this is used for web browsers but you can also incorporate it into a theme or a page (tumblr specific)

An extention to remove and block autoplay music on blogs you visit

Pop up warning/welcome message - can be used to tell people about the content of the blog or make a byf or blacklist that they can’t ignore, use sparingly