ToolSelf Blog
Guides on taxes, finance, business, and practical tools for freelancers and everyone.
Pythagorean Theorem: Practical Uses Beyond Geometry Class
a² + b² = c² appears in roof framing, distance calculations, screen diagonals and physics. Here is how to actually use it.
LLC vs S-Corp: When Does S-Corp Status Actually Save Money?
An S-Corp election can save high-earning freelancers thousands on self-employment tax. But it's not always worth the complexity. Here's when it makes sense.
SVG to PNG: When and How to Rasterize Vector Graphics
SVG scales infinitely without quality loss but lacks raster effects. Sometimes you need a PNG export — here is how to do it right.
1099 vs W2: Which is Actually Better?
A 1099 offer might look like more money, but W2 benefits are valuable. Here's how to compare the real take-home difference.
Merging and Splitting PDFs: Tools That Do Not Add Watermarks
Almost every "free" PDF tool either watermarks the output or upsells you. Browser-based tools keep your file off their servers entirely.
UUID v4 vs ULID vs Snowflake: Picking an ID Format
Random UUIDs are universal but unsorted. ULIDs and Snowflakes are sortable. The choice changes your database indexes.
Pricing Your Services: Value-Based vs Hourly vs Project Rate
Should you charge hourly, per project, or based on value delivered? Each model has pros and cons. Here's how to decide.
Setting Rates: The Psychology Behind Your Pricing
How you price affects how clients perceive your value. Charge too little and you'll be undervalued. Charge too much and you'll lose clients.
Invoice Generator: Create Professional Invoices in Minutes
A professional invoice protects you legally and gets paid faster. Here's what to include and how to automate the process.
Countdown Timer Use Cases: Beyond Just Cooking
Public deadlines beat private ones. A visible countdown changes how teams (and individuals) prioritize.
Down Payment Math: How Much Do You Actually Need
20% is the textbook number to avoid PMI. But FHA, VA and USDA loans accept 0-3.5% down — at the cost of mortgage insurance.
Tax Planning Calendar: Know Your Important Deadlines
Missing a tax deadline costs penalties. Here's a month-by-month calendar of what freelancers need to do for 2026.