I have been in the graphic design industry since 1981 working in London, Los Angeles & Spain. My career started in the traditional way on a drawing board, using Rotoring Pens, Magic Markers, Pantone Pens & Letraset working as a Designer/Visualiser/Artworker. My design career has taken me through the music, toy, t-shirt, packaging & print industry. I am now a freelance graphic designer (British) based in Spain with many clients worldwide ...now using Photoshop, Illustrator & InDesign on a Mac.
UPDATE...I have now written a guide to becoming a graphic designer. It is available as Kindle or in print ...check it out here... AMAZON LINK . Well ...I have learnt my lesson over the years ...never work for free or on a promise as it never ever works out in your favour. Ask yourself these questions:Do you know these people well?Do they have a success record with other projects making money?If they are investing money into making these cards, why are they not investing in your time and design work?At the end of the day, if it is very little work for you then you will be investing very little time into this project ...so if the equity % is good then go for it.If there is loads of work involved which eats into your time of other paying jobs and the equity % is poor then do the maths and you will probably say no.
Ask them about how much work is involved and how they plan to market these cards and then honestly value the potential of these cards doing well.
If you can see that it will lead to nothing then give a quote for your work ...or offer a discount for a small equity % ...if they can afford to print the cards and market them then they can afford to pay a designer.... if they can't then they have no money and are grasping at straws.
At the end of the day, do not under sell yourself ...good luck
UPDATE...I have now written a guide to becoming a graphic designer. It is available as Kindle or in print ...check it out here... AMAZON LINK . Well if you are a professional designer you should really have the Adobe Creating Suite in which you can do this. But if it is just a one off job and you do not want to spend money on expensive software then please check this link out for free alternatives to Adbobe Illustrator... https://vectorguru.org/featured/alternatives-to-adobe-illustrator.html ...hope this helps
UPDATE...I have now written a guide to becoming a graphic designer. It is available as Kindle or in print ...check it out here... AMAZON LINK . Well it really depends what format the original file is in. SVG is a vector format so I use Adobe Illustrator to do this ...but that is converting a vector file to SVG. Not sure if you can convert non vector files direct to SVG without a process in between to make it into a vector first. Not all formats work well in vector. I suggest doing a Google search on free SVG conversions as I am sure there are plenty of free websites that will do this I guess. Sorry I cannot be of more help. If I knew what format your original file is I might be able to help more.
-OR-
(max 20 characters - letters, numbers, and underscores only. Note that your username is private, and you have the option to choose an alias when asking questions or hosting a Q&A.)
(A valid e-mail address is required. Your e-mail will not be shared with anyone.)
(min 5 characters)
By checking this box, you acknowledge that you have read and agree to Jobstr.com’s Terms and Privacy Policy.
-OR-
(Don't worry: you'll be able to choose an alias when asking questions or hosting a Q&A.)