Image resizing and photo tools
Prepare product photos, resize images for sharing, change image formats or remove photo metadata. Choose exact canvas dimensions when a shop or listing needs consistent pictures.
Online tools for images,
PDFs and spreadsheets.
Resize photos, convert documents, clean spreadsheet data and check engineering files. Choose a tool, add your files or text, and download the result without creating an account.
CHOOSE YOUR TASK
Resize, convert and check your files
Bulk image resizer
Resize JPG, PNG and WebP photos by percentage or maximum dimensions. Keep the aspect ratio and download a batch of resized images.
Open tool →Merge PDF
Combine PDF documents into one file in your chosen order.
Open tool →Document to Markdown
Convert supported Office documents, PDFs and text files into editable Markdown.
Open tool →CSV to JSON
Convert CSV rows into JSON objects while preserving text values.
Open tool →Survey spreadsheet cleaner
Convert multi-select survey answers from Google Forms or Microsoft Forms CSV exports into separate yes/no columns without duplicating respondents.
Open tool →Modbus register map checker
Check Modbus register addresses, overlapping ranges and declared data widths. Download a findings CSV and printable register map documentation.
Open tool →Find a tool for your file or workflow
Use the format you have or the task you need to finish as your starting point. Each category links to tools with instructions, supported inputs and downloadable results.
PDF and document tools
Combine PDF files, extract pages, convert documents to Markdown or review document comments. Choose the tool for your file type: scanned PDFs and editable text documents need different workflows.
CSV, JSON and text tools
Prepare spreadsheet exports for another application. Convert CSV to JSON, combine files, remove duplicate rows or compare text before importing data into your next workflow.
Engineering and technician tools
Check exported register maps, cable schedules and PLC–HMI tag lists. Align sensor timestamps or convert engineering units before reviewing the results against your project requirements.
HR, attendance and work tools
Turn meeting exports and work records into useful tables. Reconcile course attendance, calculate shift hours and check training expiry dates using your own roster and settings.
Student and study tools
Clean survey answers for analysis, calculate weighted grades and turn study notes into flashcard files. Check the example input and grading assumptions before using a result.
Business documents and labels
Create barcode labels, generate certificates from spreadsheet data or turn a schedule into calendar events. Start from a CSV export and review the generated files before sharing or printing.
Audio, video and subtitle tools
Inspect video specifications, adjust subtitle timing or prepare podcast audio. Review the supported formats and duration limits before uploading a recording.
Design and maker tools
Prepare design files for your next step: convert an image to SVG, generate a laser-cut box layout or optimize a supported 3D model. Check dimensions and machine requirements before fabrication.
How to use the online tools
File processing explained →Choose files or import a URL
Open the tool for your task. Choose files, drag and drop them, or import a direct public file link. Use pasted text where the tool supports it.
Review the settings and examples
Choose dimensions, output formats, spreadsheet columns or matching rules. Check the example and file limits before processing.
Download and review the result
Save the converted file or report. Check the output before importing it into another application, printing it or sharing it with your team.
Questions about file conversion and online tools
Are these online tools free to use?
OpenToolDesk tools are free to use without an account or subscription. File size, batch size and supported format limits are listed on each tool page.
Can I use the tools on a phone or tablet?
Yes. The pages adapt to desktop, tablet and mobile screens. You can choose files from your device instead of dragging them. Large files and batches may need more memory, so start with a smaller batch on a phone.
Can I paste text instead of uploading a file?
Tools that support pasted input show a Paste text option after the upload area. You can also import a direct public file URL where supported. If you select a file, it takes priority over pasted text.
How do I choose the right file conversion tool?
Start with the format you have and the result you need. For example, use CSV to JSON for application data, Document to Markdown for editable document text, or Bulk image resizer for photo dimensions. Read the supported formats and limitations on the tool page.