JubKub practical guides

Choose the right tool and check its limits before you start

Use these guides to choose a tool and plan the steps before you begin. Each section covers a common task, what to check, and a limitation that can affect the output.

Published by JubKub · About the publisherWritten to help readers choose a workflow and inspect output before using it elsewhere.Features were reviewed against JubKub tool pages and source code on September 29, 2026; actual file results still depend on the file and device.

Prepare images before sending or publishing

Cropping, resizing, compression and format conversion solve different problems. Start with the issue you need to fix instead of converting every image automatically.

Identify the problem first: crop excess space, resize dimensions that are too large, or compress a file whose dimensions are already right but whose size is too large.
If the image needs a transparent background, avoid converting it to JPG because JPG does not preserve transparency.
After compression, check sharpness, color, small text and pixel dimensions. JubKub's image compressor keeps the original dimensions, so it does not replace resizing.

Worked example

Example: a form accepts images up to 1,200 × 1,200 pixels, but the source is 3,000 × 2,000. Resize to meet the requirement first, then compress. Final file size depends on the image and settings.

Compress images Resize images Crop images Convert JPG to WebP

Organize PDF pages before sharing

Merging, reordering, splitting and compressing PDFs solve different problems. Check page order and the exported file before sharing it.

Merge PDFs when several files belong in one packet, then check that the files appear in the order readers should see them.
Use page management to rotate or remove pages; split a PDF when you need to send only selected pages.
If the file is too large, use a separate PDF compression tool. Removing or rearranging pages does not automatically compress the remaining scanned images.
Open the result and check the first, middle and last pages, especially when page numbers are referenced elsewhere.

Worked example

Example: to keep pages 1–3, 5 and 8, enter 1-3,5,8 in the split tool. If you want to remove those pages, use the delete-pages tool instead and check the remaining pages before downloading.

Merge PDFs Organize PDF pages Split PDFs Compress PDFs

Use OCR with Thai documents

OCR reads text from an image or scanned PDF and returns editable text. It is useful when you cannot select text in the source, but it does not recreate the original page layout.

If you can select and copy text in a PDF, try PDF to Text first. Use OCR when the text is part of a scan or image.
Choose Thai, English or both to match the document. A straight image with clear text and even lighting is easier to read.
Check names, document numbers, dates, amounts and tables against the source. OCR can confuse blurry text, small type or similar-looking digits.

Worked example

Example: for a receipt with Thai merchant text and Arabic numerals, select Thai + English, then compare the total, date and reference number with the original before copying the result.

OCR images and PDFs Extract text from searchable PDFs Clean copied Thai text

Work with Thai Excel and CSV files

XLSX can hold multiple sheets, formulas and cell formatting. CSV is a text table for exchanging data, but it does not preserve all workbook features.

Before converting XLSX to CSV, check which sheet you need. This converter uses the first worksheet, and CSV does not retain Excel colors, fonts, images or merged cells.
If Thai text looks garbled when opening a CSV, export with the option that adds a UTF-8 BOM, then reopen it in the destination program.
Before importing a CSV into a CRM, ERP or other system, check headers, delimiters, date columns and leading zeroes; the destination may interpret values differently.
When removing duplicate data or blank rows, review the preview and keep a copy of the original in case you need to restore it.

Worked example

Example: an XLSX workbook has a data sheet and a summary sheet, but you need to export only raw data as CSV. Put or copy the needed data into the first worksheet before converting; the converter uses that worksheet.

Convert XLSX and CSV Clean a spreadsheet Convert CSV to XLSX

Check Thai word and character counts

Thai word counting needs word segmentation; spaces alone are not enough. A character count can also differ from visible symbols, especially for emoji and combining marks.

Paste the complete text and check the metric you need: words, characters including spaces, or characters excluding whitespace.
For a social post or form, count the final version after adding hashtags, URLs and emoji. Each platform can apply its own length rules.
Treat estimated reading time as a guide only. Actual reading speed depends on the reader and the text format.

Worked example

Example: if a post has a character limit, use the no-whitespace total as a rough check, then review the final post in its target platform because URLs, emoji and hashtags can have platform-specific rules.

Count words and characters Compare text Clean Thai text

Check figures before calculating a price

A calculator can compare price, discount, VAT and profit quickly, but the result depends on entering costs correctly and choosing the right calculation method.

Clarify whether the entered price is before VAT or already includes VAT.
Include the costs you intend to account for, and choose margin or markup deliberately because they use different bases.
Use the result as a mathematical check, then compare it with your invoice, sales terms and the rate used by your business before issuing a document.

Worked example

Example: at a cost of ฿100 and a sale price of ฿150, profit is ฿50, margin is 33.33% of the selling price, and markup is 50% of cost. These percentages are not interchangeable.

Calculate VAT, discounts and profit

Not sure where to start?

Choose the task you need, then check the file formats and limits on the tool page before starting.

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