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Dee4u Free Tools Collection

One page to find every free online tool on dee4u.com and tools.dee4u.com. Designed for usability across general users, marketers, and developers — with internal links back to relevant articles on dee4u.com.

Overview of Dee4u tools

Thai Utilities

Baht Text (Number to Thai Baht)

Convert Thai/Arabic numerals into Thai Baht text instantly.

  • Thai & Arabic numerals
  • Handles decimals properly
Try it

Thai–Gregorian Date Converter

Convert AD↔BE, show weekday, choose output formats.

  • Thai & Arabic numerals
  • Quick copy
Date Converter

Land Unit Converter (Rai–Ngan–Wah)

Convert Rai/Ngan/Wah ↔ square meters with standard formulas.

  • 1 Rai = 1600 m²
  • Precise decimals
Convert Now

Text & Developer Tools

Text Case Converter

UPPER / lower / Capitalize / camelCase / snake_case — runs in browser.

Convert Case

Character Counter

Counts characters/words/sentences; set a limit (e.g., 280).

Count Text

Key/Password Generator

Length 8–128, choose character sets.

Generate Key

Encoder / Decoder

Base64 & URL encode/decode for text/files.

Encode/Decode

JSON Formatter & Validator

Pretty/Minify/Sort keys + error line highlight. Offline.

Format JSON

Files & Data

Merge / Split PDF

Merge multiple files or split pages into files.

Manage PDF

CSV / JSON → Table

Preview as table, search, paginate, export to Excel.

Preview Table

CSV/JSON Diff & Merge

Compare and merge data without storing files.

Diff/Merge Data

Resize Image

Set dimensions/quality — great for web images.

Resize Image

SEO & Marketing

Slug Generator (Thai → Romanization)

Choose delimiter, Strict SEO mode, live URL preview.

Make Slug

UTM Builder (GA4-ready)

Manage UTM params, save list, export CSV.

Build UTM

robots.txt / Sitemap.xml

Set user-agent/disallow and build XML sitemap easily.

robots.txt  •  Sitemap

Networking & Finance

WHOIS / IP Lookup

See country, city, ISP/ASN, and open raw JSON.

Lookup IP

Loan Calculator

Home/auto/personal/credit; supports balloon & prepayment.

Loan Calc

Continue Reading on Dee4u

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Blog & How-to: Step-by-step for Every Tool

Pro tip: Press Ctrl+F and type a tool name to jump instantly.

Baht Text Thai–Gregorian Date Rai–Ngan–Wah Text Case Counter Key/Password Encoder/Decoder JSON PDF Table Diff & Merge Resize Slug UTM robots.txt Sitemap WHOIS/IP Loan

Baht Text (Number → Thai Baht)

  1. Open TH-Baht-Text
  2. Enter a number e.g. 12345.67 (Thai/Arabic)
  3. Get the Thai Baht wording instantly
  4. Copy to your document

Add “ถ้วน” (exact) for integer amounts in Thai documents.

Thai–Gregorian Date Converter

  1. Go to Date Converter
  2. Pick a date (supports BE/AD)
  3. View multiple formats and weekday
  4. Copy the output

Prefer ISO-8601 (YYYY-MM-DD) when exchanging data.

Land Unit Converter

  1. Open Rai-Ngan-Wah
  2. Input Rai/Ngan/Wah or m²
  3. Convert and review decimal result

1 Rai = 4 Ngan = 400 Wah² = 1600 m².

Text Case Converter

  1. Go to Text Case
  2. Paste text → choose case style
  3. Copy result

Use kebab-case for URLs and image filenames.

Character Counter

  1. Open Counter
  2. Paste text to see counts
  3. Set a limit (e.g., 280)

Good meta descriptions are ~150-160 chars.

Key/Password Generator

  1. Open Key Generator
  2. Set length 8–128 and char sets
  3. Generate and store in a password manager

Enable 2FA and never reuse passwords.

Encoder / Decoder

  1. Go to Encoder/Decoder
  2. Choose Base64 or URL
  3. Encode/Decode instantly

Always URL-encode query parameters.

JSON Formatter & Validator

  1. Open JSON Tool
  2. Paste JSON → Pretty/Validate
  3. Fix lines with reported errors

Sort keys for cleaner diffs in code review.

Merge / Split PDF

  1. Open PDF Tools
  2. Choose Merge or Split
  3. Upload → Process → Download

Compress scanned PDFs before upload.

CSV / JSON → Table

  1. Go to Table Preview
  2. Drag CSV/JSON into the page
  3. Search/sort and export to Excel

Ensure UTF-8 to avoid garbled text.

CSV/JSON Diff & Merge

  1. Open Diff & Merge
  2. Upload base and updated files
  3. Review differences → Merge

Always diff before merging to reduce mistakes.

Resize Image

  1. Open Resize
  2. Set width/height or % + quality
  3. Preview → Download

Add descriptive alt and match layout width.

Slug Generator (Thai → Romanization)

  1. Open Slug Generator
  2. Paste title → choose delimiter
  3. Enable Strict to remove special chars

Short, clear, keyword-focused URLs boost CTR.

UTM Builder (with saved lists)

  1. Open UTM Builder
  2. Fill utm_source/medium/campaign (+ content/term)
  3. Generate and copy the link

Use lowercase and hyphens consistently.

robots.txt Generator

  1. Open robots.txt
  2. Set User-agent, Allow/Disallow, Sitemap
  3. Deploy as /robots.txt

Don’t block important content pages.

Sitemap.xml Generator

  1. Go to Sitemap
  2. Provide URLs and changefreq/priority
  3. Submit in Search Console

Update whenever new pages go live.

WHOIS / IP Lookup

  1. Open WHOIS/IP
  2. Enter a domain or IP
  3. See country/city/ISP/ASN and Raw JSON

Use ASN for routing checks and suspicious traffic blocks.

Loan Calculator

  1. Open Loan Calculator
  2. Set principal, rate, term (months)
  3. Try prepayment/balloon to compare

Small extra payments can slash total interest.

Suggested Workflow: Dev + SEO + Data

  1. Publish → make a clean slug → update sitemap
  2. Run campaigns → attach UTMs
  3. Aggregate CSVs → Table / Diff & Merge
  4. Optimize images with Resize for better Web Vitals