Guides

Burn subtitles into video online without upload

Hardcode SRT or VTT captions into MP4 or WebM locally in your browser with style controls.

Subtitle CPS and WPM readability guide

Use CPS and WPM thresholds to improve subtitle readability and viewer retention.

How to fix subtitle timing and sync issues

A practical workflow to resync subtitles and prevent timing drift before publishing.

SRT vs VTT: which subtitle format should you use?

Compare SRT and VTT with practical format decisions for modern publishing workflows.

Merge CSV files safely with header checks

Combine multiple CSV files without schema drift using header mapping and validation.

Remove duplicates in CSV or Excel fast (without bad deletions)

Clean duplicate rows quickly using key-based rules, QA checks, and local processing.

Convert CSV to JSON without upload (privacy-first workflow)

Turn CSV into clean JSON in your browser with validation, examples, and no file upload.

Convert Unix timestamp to date correctly

Convert epoch values to readable dates without timezone and unit mistakes.

Generate meta tags for SEO with examples

Create stronger title and description tags with practical SEO examples.

URL encode vs decode: common mistakes

Prevent broken links by encoding the right URL parts at the right time.

Base64 encode vs decode: practical use cases

Understand when to encode, when to decode, and how to avoid common errors.

Uppercase, lowercase, and title case: when to use each

Choose the right text casing style for UI, SEO, and editorial consistency.

Compare two texts for differences

Find exact changes between versions with a practical text diff workflow.

Remove extra spaces from text

Clean whitespace issues in text before publishing, indexing, or exporting.

Character count with or without spaces

Measure text length correctly for fields that include or exclude spaces.

Split PDF pages quickly

Extract the exact pages you need from large PDF documents in minutes.

Compress PDF without losing quality

Reduce PDF size while preserving readability and print quality.

Merge PDF files without upload

Join PDF files in your browser while keeping document handling private.

How to merge multiple CSV files

Combine many CSV files without breaking headers, order, or data types.

Convert CSV to JSON safely

Turn CSV files into clean JSON with reliable type and schema checks.

CSV vs Excel: which format should you use?

Choose the right file format for analysis, sharing, and automation.

Remove duplicate rows in Excel and CSV

Clean repeated rows safely while keeping the records that matter.

Validate JSON before API requests

Catch schema and syntax issues early before payloads hit your API.

JSON minify vs beautify: when to use each

Learn when compact JSON helps and when readable formatting is better.

How to extract JSON from AI responses

Isolate clean JSON from mixed AI output without manual guesswork.

How to count tokens in GPT-4 and GPT-3.5

Estimate prompt and response token usage before sending API calls.

How to fix invalid JSON from ChatGPT

Repair malformed ChatGPT JSON quickly with a reliable cleanup workflow.

How to convert timestamps

Switch between Unix time and readable dates.

How to compare two texts (diff)

Spot differences line by line quickly.

How to resize images without distortion

Keep proportions while resizing images with quality.

How to use Base64 encoding

Encode and decode text and images with Base64.

How to generate slugs for SEO

Turn titles into clean, readable URL slugs.

How to clean and normalize text

Remove noise and standardize text for reuse.

How to create a printable calendar

Generate weekly, monthly, and yearly calendars online.

How to convert units accurately

Convert common units with consistent formulas.

How to create strong passwords

Build secure passwords and passphrases that are easy to use.

How to format and validate JSON

Keep JSON clean, readable, and valid in seconds.

How to generate QR codes safely

Create QR codes with privacy in mind.

How to compress images online

A simple workflow to reduce image size with clear steps.